i want to ask the flow

example
we have 10 leads/subscriber
then 2 is unsubscribe, so this 2 leads will get unsubscribe label

but how if one of them resubscribe again?
A.is the unsubscribe label removed automaticly?
B.he can moved in to another label, both with unsubscribe label?

because when i broadcasting message
i will separate/exclude the leads who marked as unsubscriber

how if like poin B above?
one subscriber get regular label but also have marked as unsubscriber label

thanks