If (G, .) is a group such that (ab)- 1 = b-1 a-1, ∀ a, b ∈ G, then G is a/an

If (G, .) is a group such that (ab)- 1 = b-1 a-1, ∀ a, b ∈ G, then

1.	If (G, .) is a group such that (ab)- 1 = b-1 a-1, ∀ a, b ∈ G, then G is a/an
A.	abelian group
B.	commutative semi group
C.	None of these
D.	non-abelian group
Answer» E.

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If (G, .) is a group such that (ab)- 1 = b-1 a-1, ∀ a, b ∈ G, then G is a/an

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