Which of the following

(b) The unit place of the square of $14=4^{2}=16=6$

The unit place of the square of $62=2^{2}=4$                   $\left[\because 2^{2}=4\right]$

The unit place of the square of $27=7^{2}=49=9$

The unit place of the square of $35=5^{2}=25=5$

Clearly,  $62^{2}$ has 4 at the unit's place.