With Regard to Release of Neurotransmitter in the Brain, "Kiss

With regard to release of neurotransmitter in the brain, "kiss and run" refers to the situation in which the vesicle

A) releases most of its contents into the cleft and the vesicle remains attached to the presynaptic membrane.
B) closes before releasing any molecules and then moves to the cell interior.
C) remains open until the next action potential.
D) releases most of its contents into the cleft, after which the vesicle breaks away from the presynaptic membrane and is refilled.
E) merges completely with the presynaptic membrane.