Solve the Equation $$x ^ { 2 } \left( x ^ { 2 } + 3 \right) = 54$$

Multiple Choice

Solve the equation. $$x ^ { 2 } \left( x ^ { 2 } + 3 \right) = 54$$

A) $\{ \pm 6 i , \pm 3 \}$
B) $\{ \pm 6 , \pm 3 \}$
C) $\{ \pm 6 , \pm 3 i \}$
D) $\{ \pm \sqrt { 6 } , \pm 3 i \}$