Find All Complex Zeros of the Polynomial Function $$f ( x ) = x ^ { 4 } - 9$$

Multiple Choice

Find all complex zeros of the polynomial function. Give exact values. List multiple zeros as necessary.
- $$f ( x ) = x ^ { 4 } - 9$$

A) $\sqrt { 3 } , \sqrt { 3 } \mathrm { i }$
B) $\sqrt { 3 } , - \sqrt { 3 }$
C) $\sqrt { 3 } , - \sqrt { 3 } i , \sqrt { 3 } i , - \sqrt { 3 }$
D) $\sqrt { 3 } , - \sqrt { 3 } , 3 \mathrm { i } , - 3 \mathrm { i }$