If X∼Binomial(n,p)X \sim \text{Binomial}(n, p)X∼Binomial(n,p), which of the following is the formula for the variance Var(X)Var(X)Var(X)?
npnpnp
n(1−p)n(1-p)n(1−p)
np(1−p)np(1-p)np(1−p)
np(1−p)\sqrt{np(1-p)}np(1−p)