Pattern Duel

The scenarios below are the pairs patterns get mistaken for most often, straight from each pattern's own "don't confuse it with" section. Pick the one that actually fits - the wrong half of the pair is never a random distractor, it is the specific pattern this one keeps getting confused with.

Duel 1 of 8

An EventManager keeps a list of listeners and calls each one when a save event fires. No listener knows about any other listener.