The set of integers Z with the binary operation "*" defined as a*b =a +b+ 1 for a, b ∈ Z, is a group. The identity element of this group is

The set of integers Z with the binary operation "*" defined as a*b

1.	The set of integers Z with the binary operation "" defined as ab =a +b+ 1 for a, b ∈ Z, is a group. The identity element of this group is
A.	-1
B.	0
C.	1
D.	2
Answer» B. 0