Testing a Bernoulli proportion — the Wald statistic

Suppose $X\sim B(1,p)$ distribution, $0<p<1$. On the basis of a random sample of size $n$ from the distribution of X, we want to test $H_0:p=p_0$ against the alternative $H_1:p\neq p_0$, where $p_0$ is a specified constant. Then asymptotic null distribution of which of the following test statistics is $N(0,1)$?