Identify the Center and Radius of the Circle $9 x ^ { 2 } + 9 y ^ { 2 } - 16 = 0$

Multiple Choice

Identify the center and radius of the circle $9 x ^ { 2 } + 9 y ^ { 2 } - 16 = 0$ .

A) center: (3,3) radius: 4
B) center: (0,0) radius: $\frac{4}{3}$
C) center: (0,0) radius: $\frac { 3 } { 4 }$
D) center: (0,4) radius: $\frac { 1 } { 3 }$
E) center: (0,4) radius: $\frac { 1 } { 9 }$