Solve Express Any Nonreal Complex Numbers with I Notation $$x ^ { 4 } - 6 x ^ { 2 } - 27 = 0$$

Multiple Choice

Solve. Express any nonreal complex numbers with i notation.
- $$x ^ { 4 } - 6 x ^ { 2 } - 27 = 0$$

A) $x = \pm 3 , \pm i \sqrt { 3 }$
B) $x = 3 , i \sqrt { 3 }$
C) $x = - 9,3$
D) $x = \pm \sqrt { 3 } , \pm 3 \mathrm { i }$