In What Way Are "Hooking Up" and "Friends with Benefits

In what way are "hooking up" and "friends with benefits" similar to each other?

A) They are both forms of casual sex outside the bounds of a romantic relationship.
B) They are both forms of casual sex within the bounds of a romantic relationship.
C) They are both unplanned sexual encounters between two strangers.
D) They are both unplanned sexual encounters between platonic friends.