The circle $x^2+y^2-10x+16 =0$ and $ x^2+y^2=r^2$ intersect each other in two distinct points if

Question

$\begin{array}{1 1} r < 2 \\ r< 8 \\ 2 < r< 8 \\ 2 \leq r \leq 8 \end{array} $