Given a≡3(mod5)a \equiv 3 \pmod{5}a≡3(mod5), which of the following is equivalent to a2(mod5)a^2 \pmod{5}a2(mod5)?
9(mod5)9 \pmod{5}9(mod5) which is 444
6(mod5)6 \pmod{5}6(mod5) which is 111
3(mod5)3 \pmod{5}3(mod5) which is 333
0(mod5)0 \pmod{5}0(mod5) which is 000