Find the Standard Form of the Equation of the Parabola $( 10,0 )$

Multiple Choice

Find the standard form of the equation of the parabola.
-Focus at $( 10,0 )$ , directrix $x = - 10$

A) $y = \frac { 1 } { 40 } x ^ { 2 }$
B) $40 \mathrm { y } = \mathrm { x } ^ { 2 }$
C) $x = \frac { 1 } { 40 } y ^ { 2 }$
D) $y ^ { 2 } = 40 x$