<> Subject Test Which of the following functions are the isomorphisms? a) :(Z,+)→(Z,+) defined by o(n)= 2n, for xeZ b) 0:(Q+)→(Q+) defined by $(x) =, for IEQ c) :(Z,+)→(Z, +) defined by (n)=n+1, for reZ d) :(Q.-)→(Q.-) defined by (x)=x, for xeQ Answer OA Oc C.

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