Which of the following statements generates a random number between $O$ and $50?$

a$.$ srand $($time $(10))$;

num $=$rand$\frac{?}{50}$;

b$.$ srand $($time $(0))$;

num $)50$;

C$.$ srand $($time $(10))$;

num $=$rand$()$ & $50$ ;

d$.$ srand $($time $(0))$;

num $=$ rand $()$ & $50$ ;