The Presence of Vesicular Glutamate Transporters and Vesicular Monoamine Transporters

The presence of vesicular glutamate transporters and vesicular monoamine transporters in the same neurons suggests that

A) cells that contain a lot of glutamate must store it in multiple types of vesicles.
B) glutamate can be co-released as a neurotransmitter along with dopamine or serotonin.
C) vesicular transporters are not selective.
D) gene expression has gone wrong in these neurons.