For the equation $\sqrt{px+4}=x+2$ the value of $p$ is $-2$, what is the solution set of the above equation ?

Question

$\begin{array}{1 1} (a)\; \{-6,0\}\\ (b)\; \{6,0\} \\ (c)\; \{1/6,0\} \\ (d)\; \{-1/6, 0\} \end{array}$