Post settings for Instagram , what does those settings mean exactlty?

Lets say for example i have a standard campain with 1000 posts in the post list and 10 accounts in a destination list , where only this campain posts in the certain destination list

1)When publishing send one post for each destination.

a)Does that mean for the days the campain is set to post , it will send one post/day ,to every of the specified accounts in the destination list ?So both the 10 accounts will end with the same post posted once at them ?Or the campain will send 1 random post from the post list to each account ? Ending up the 10 accounts at the same day with 1 post at them that is Different ?(or may same if the randomizer picks for example the same post for more than 1 accounts )?

2)Choose a random post from the post list :
a)Does that mean that if i have already checked the (1) , the campain will choose to post , one post to each of the 10 accounts for the certain day , that will be chosen randomly from the destination list , so at the end of the posting day the 10 accounts will end up propably with +1 post that is different from the other x/10 accounts ?
b)Or does that mean that each day the campain is posting to the 10 accounts, will choose just a random post from the post list to be posted on all 10 accounts , so the 10 accounts end up with the same post at the end of the posting day and just this post is picked up randomly from the post list ?

3)Uselect the destination after a succesful post(the campain will post only once in each destination).
a)Does that mean , that if i have Not selected this option , even if i have selected the (1) , the campain May post 10 times the same post on only 1/10 accounts in the worst case ?So the 1 account ends up with the same post posted 10 times on it , and the other 9/10 with no post posted in them the certain day ?
What is really the use of the number 3 setting as the 1 describes the same ?

When to Publish :
-If i set a campain , publishing 10 posts/posting day , (the campain will publish "10 post list items per day) : does that ean 10 posts for each account , or 10 on total so any account ends up with +1 post , where the post is selected based on setting 1,2,3 that i described above ?

Thanx a lot and sorry for so many questions , but i am a believer that if i am not sure what i am doing in a good extent ,better to not do it at all , as the results will be also random and propably much more different than those i want to achive

1. When publishing send one post for each destination - if checked this option will send different post from Posts list to each destination you have in your destination lists. So if you have added 10 accounts (destinations) to destination list , when the time comes, 10 different posts (assuming you have that many in the Posts list) will be sent to 10 accounts.

2. Choose a random post from the post list - if checked, whenever publishing time comes, 1 random post from Posts list will be selected and published to number of destinations that you’ve set in When to publish tab.

3. Uselect the destination after a succesful post - This option will unselect the destination from destination list, while this doesn’t happen if you use option 1. Once you publish just one post, destination is immediately unselected so you never publish any posts on it (inside that campaign). If you use this option, when each destination in your destination list gets one post, all of them will be unselected and the destination list will be empty.

If you set campaign to publish 10 post list items and set it to publish on all destinations (assuming you have 10 of them), it will publish 10 posts on each account, so that’s 100 posts in total.

Hi and really thanx for the answer.To the second “Choose a random post from the post list - if checked, whenever publishing time comes, 1 random post from Posts list will be selected and published to number of destinations that you’ve set in When to publish tab” , will then any account that belong in this destination list , end with the same random post ?
thanx

for number 1.
how about in the post list have 2-3 same image , with same/different caption.
is it still make a post to destination in that time? or the other image is post in next day?