Equation of a circle is given by $x^2 + y^2-8x + 4y+5=0$. The centre and radius of the above circle is

Question

$\begin{array}{1 1} (a)\; (4,2) \;and\; \sqrt{15} \\ (b)\; (4,-2) \;and \; \sqrt{15} \\ (c)\; (-4,2) \;and\; 15 \\(d)\; (-4,-2) \;and \;15 \end{array}$