Find the Derivative of the Function at the Given Value $$f ( x ) = x ^ { 3 } - 20 ; x = 3$$

Multiple Choice

Find the derivative of the function at the given value of x.
- $$f ( x ) = x ^ { 3 } - 20 ; x = 3$$

A) 27
B) 81
C) $- 7$
D) 9