Find the Standard Deviation $\sigma$ , for the Binomial Distribution Which Has the Stated Values

Multiple Choice

Find the standard deviation, $\sigma$ , for the binomial distribution which has the stated values of $n$ and $p$ . Round your answer to the nearest hundredth.
$n = 503 ; p = 0.7$

A) $\sigma = 7.87$
B) $\sigma = 14.40$
C) $\sigma = 10.28$
D) $\sigma = 13.55$