Find the Center and Radius of the Circle $x^{2}+y^{2}-4 x+2 y-20=0$

Multiple Choice

Find the center and radius of the circle.
- $x^{2}+y^{2}-4 x+2 y-20=0$

A) $(1,-2) ; r=25$
B) $(2,-1) ; r=5$
C) $(-1,2) ; \mathrm{r}=5$
D) $(-2,1) ; r=25$