Use the Given Information to Find the Equation of the Hyperbola

Use the given information to find the equation of the hyperbola. The foci are $( \pm 6,0 )$ and the directrices are $x = \pm 3$

A) $9 x ^ { 2 } - 5 y ^ { 2 } = 18$
B) $9 x ^ { 2 } - y ^ { 2 } = 61$
C) $x ^ { 2 } - 5 y ^ { 2 } = 61$
D) $x ^ { 2 } - y ^ { 2 } = 18$
E) $2 x ^ { 2 } - y ^ { 2 } = 18$