Write an Equation for the Hyperbola $( 3,0 ) , ( - 3,0 )$

Write an equation for the hyperbola.
-vertices at $( 3,0 ) , ( - 3,0 )$ ; foci at $( 9,0 ) , ( - 9,0 )$

A) $\frac { x ^ { 2 } } { 81 } - \frac { y ^ { 2 } } { 9 } = 1$
B) $\frac { x ^ { 2 } } { 9 } - \frac { y ^ { 2 } } { 81 } = 1$
C) $\frac { x ^ { 2 } } { 9 } - \frac { y ^ { 2 } } { 72 } = 1$
D) $\frac { x ^ { 2 } } { 72 } - \frac { y ^ { 2 } } { 9 } = 1$