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

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