Let f be a homomorphism from a group G into a group G'. Then which of the following is not true?

1
f(e) = e', where e and e' are identities of G, G' respectively
2
f(a-1) = [f(a)]-1, ∀ a ∈ G
3
f(G) is a subgroup of G'
4
None of the above 

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