Find an Equation for the Ellipse Described $( 0,0 )$ ; Focus At

Multiple Choice

Find an equation for the ellipse described.
-Center at $( 0,0 )$ ; focus at $( 5,0 )$ ; vertex at $( 7,0 )$

A) $\frac { x ^ { 2 } } { 49 } + \frac { y ^ { 2 } } { 24 } = 1$

B) $\frac { x ^ { 2 } } { 25 } + \frac { y ^ { 2 } } { 24 } = 1$

C) $\frac { x ^ { 2 } } { 25 } + \frac { y ^ { 2 } } { 49 } = 1$

D) $\frac { x ^ { 2 } } { 24 } + \frac { y ^ { 2 } } { 49 } = 1$