1. Suppose A = 2 -3 4 12 1 B= 4 -7 3 C = ( 1 a. If possible, give AB. If the product is not defined, then give a reason. b. If possible, give BA. If the product is not defined, then give a reason. . If possible, give AC. If the product is not defined, then give a reason. d. If possible, give CA. If the product is not defined, then give a reason. th