Find an Equation for the Hyperbola Described $( 9,4 )$ ; Focus At

Find an equation for the hyperbola described.
-center at $( 9,4 )$ ; focus at $( 7,4 )$ ; vertex at $( 8,4 )$

A) $( x - 9 ) ^ { 2 } - \frac { ( y - 4 ) ^ { 2 } } { 3 } = 1$
B) $( x - 4 ) ^ { 2 } - \frac { ( y - 9 ) ^ { 2 } } { 3 } = 1$
C) $\frac { ( x - 4 ) ^ { 2 } } { 3 } - ( y - 9 ) ^ { 2 } = 1$
D) $\frac { ( x - 9 ) ^ { 2 } } { 3 } - ( y - 4 ) ^ { 2 } = 1$