Under the Brady Handgun Violence Prevention Act

Under the Brady Handgun Violence Prevention Act:

A) handgun purchasers must undergo a background check through the National Instant Criminal Background Check System (NICS)
B) handgun purchasers who have already had a background check to obtain a concealed carry permit do not need to undergo a (NICS) check.
C) gun collectors selling guns from their private collection are not required to run a background check on gun purchasers.
D) A, B, C, and D.
E) none of the above