Let (G,*) be a group, then what is inner automorphism?
1
if f is a mapping from G to G such that fa(x) = axa⁴, for all x belongs to G.
2
if f is a mapping from G to G such that fa(x) = axa², for all x belongs to G.
3
if f is a mapping from G to G such that fa(x) = axa⅝, for all x belongs to G.
4
if f is a mapping from G to G such that fa(x)= ax a-1, for all x belongs to G.