Find the Center and Radius of the Circle $x ^ { 2 } + y ^ { 2 } = 49$

Multiple Choice

Find the center and radius of the circle $x ^ { 2 } + y ^ { 2 } = 49$ .

A) center: (0,0) ,radius: 11
B) center: (-1,1) ,radius: 11
C) center: (0,0) ,radius: 7
D) center: (-1,-1) ,radius: 7
E) center: (-7,-11) ,radius: 7