Which Strategy/strategies Did Malinow's Laboratory Use to Investigate the Role

Which strategy/strategies did Malinow's laboratory use to investigate the role of AMPA receptors in memory formation? (Select all that apply.)

A) They used the AMPA receptor inhibitor CNQX.
B) They prevented calcium from entering NMDA receptors.
C) They used a virus to delivery dummy AMPA receptors to the amygdala.
D) They used a virus to deliver artificial AMPA receptors to the amygdala.
E) They used a fear conditioning procedure.