If set x = {a, b, c, d}, then number of binary operations that can be defined on x is

If set x = {a, b, c, d}, then number of binary operations that can be

1.	If set x = {a, b, c, d}, then number of binary operations that can be defined on x is
A.	24
B.	42
C.	416
D.	216
Answer» E.