The center of circle inscribed in square formed by the lines $x^2-8x+12=0$ and $y^2-14\;y+45=0$ is

Question

$\begin{array}{1 1}(A)\;(4,7) \\(B)\;(7,4)\\(C)\;(9,4) \\(D)\;(4,9) \end{array}$