Use the Square Root Property to Solve the Equation $x ^ { 2 } - 19 = 0$

Multiple Choice

Use the square root property to solve the equation.
$x ^ { 2 } - 19 = 0$

A) $\{ - \sqrt { 19 } , \sqrt { 19 } \}$
B) $\left\{ \frac { 19 } { 2 } \right\}$
C) $\{ \sqrt { 19 } \}$
D) $\{ 361 \}$