Which two MAC addresses are valid?

Which two MAC addresses are valid? (Choose two.)

A.
00:10:74:C9:CD:C0

B.
0010.CC71.4BF9.AE0E.AE0E

C.
00:10:F9:F9:CC:70:8D:80

D.
0010.E686.3ED4

E.
0010.68F7