(Z,*) is a group with a*b = a+b+1 ∀ a, b ∈Z. The inverse of a is

(Z,*) is a group with a*b = a+b+1 ∀ a, b ∈Z. The inverse of a i

1.	(Z,) is a group with ab = a+b+1 ∀ a, b ∈Z. The inverse of a is
A.	0
B.	-2
C.	a-2
D.	-a-2
Answer» E.