Find All Complex Zeros of the Polynomial Function $$f ( x ) = x ^ { 4 } - 5 x ^ { 2 } - 36$$

Multiple Choice

Find all complex zeros of the polynomial function. Give exact values. List multiple zeros as necessary.
- $$f ( x ) = x ^ { 4 } - 5 x ^ { 2 } - 36$$

A) $- 2 i , 2 i , 3 i , - 3 i$
B) $- 2 i , 2 i , 6 , - 6$
C) $- 2 i , 2 i , 3 , - 3$
D) $- 2 i , 2 i , 6 i , - 6 i$