Find the Domain Of $x$ In the Expression $\sqrt { 25 - 16 x ^ { 2 } }$

Multiple Choice

Find the domain of $x$ in the expression. Use a graphing utility to verify your result.
$\sqrt { 25 - 16 x ^ { 2 } }$

A) $\left[ - \frac { 5 } { 4 } , - \frac { 5 } { 4 } \right]$
B) $\left[ - \frac { 4 } { 5 } , - \frac { 4 } { 5 } \right]$
C) $\left[ - \frac { 4 } { 5 } , \frac { 4 } { 5 } \right]$
D) $\left[ \frac { 5 } { 4 } , \frac { 5 } { 4 } \right]$
E) $\left[ - \frac { 5 } { 4 } , \frac { 5 } { 4 } \right]$