$x^2+ y^2– 4x–8y–45=0$ find the centre and radius of the circles.

Question

$\begin {array} {1 1} (A)\;(2,4) \: and \: \sqrt{65} & \quad (B)\;(-2,4) \: and \: \sqrt{65} \\ (C)\;(-2,-4) \: and \: \sqrt{65} & \quad (D)\;(2,-4) \: and \: \sqrt{65} \end {array}$