2.If G be a group and a,b belongs to G,then what is (ab)^-1?

A.1/ab B.1/a^-1b^-1C.a^-1b^-1D.b^-1a--1 or:A.1/ab B.1/a^-1b^-1C.a^-1b^-1D.b^-1a--1

A.1/ab B.1/a^-1b^-1C.a^-1b^-1D.b^-1a--1

or:A.1/ab B.1/a^-1b^-1C.a^-1b^-1D.b^-1a--1

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