Solve Express Any Nonreal Complex Numbers with I Notation $$x ^ { 4 } - 40 x ^ { 2 } + 144 = 0$$

Multiple Choice

Solve. Express any nonreal complex numbers with i notation.
- $$x ^ { 4 } - 40 x ^ { 2 } + 144 = 0$$

A) $x = 2,6$
B) $x = \pm 2 i , \pm 6 \mathrm { i }$
C) $x = \pm 2 , \pm 6$
D) $x = 4,36$