Optogenetic Stimulation Is Critical in the Search for Engrams Because

Optogenetic stimulation is critical in the search for engrams because _______. (Select all that apply.)

A) it is critical to tagging neuron2
B) light stimulation is critical to expression of ChR2.
C) when dox is removed from the diet ChR2 channels can be expressed.
D) this method permits the activation of tagged engram neurons that responded to behavioral training
E) None of the above