Solve the Equation $$x ^ { 2 } = 4$$ A) $\pm 2 \mathrm { i }$

Solve the equation.
- $$x ^ { 2 } = 4$$

A) $\pm 2 \mathrm { i }$

B) $\pm i \sqrt { 2 }$

C) $\pm \sqrt { 2 }$

D) $\pm 2$