Write the Equation of the Circle with the Given Center $x ^ { 2 } - y ^ { 2 } = 3$

Multiple Choice

Write the equation of the circle with the given center and radius.
-Center (0, 0) ,radius 3

A) $x ^ { 2 } - y ^ { 2 } = 3$
B) $x ^ { 2 } + y ^ { 2 } = 6$
C) $x ^ { 2 } + y ^ { 2 } = 9$
D) $x ^ { 2 } + y ^ { 2 } = 3$