Let A order(axb) and B order(cxd) be two matrices, then if AB exists, the order of AB is?

Let A order(axb) and B order(cxd) be two matrices, then if AB exists,

1.	Let A order(axb) and B order(cxd) be two matrices, then if AB exists, the order of AB is?
A.	axd
B.	bxc
C.	axb
D.	cxd
Answer» B. bxc