Write the Expression with Only Positive Exponents and Evaluate If $( 4 x ) ^ { - 3 }$

Multiple Choice

Write the expression with only positive exponents and evaluate if possible. Assume all variables represent nonzero real
numbers.
- $( 4 x ) ^ { - 3 }$

A) $- 12 x$
B) $- 64 x ^ { 2 }$
C) $\frac { 1 } { 64 x ^ { 3 } }$
D) $- \frac { 1 } { 12 x }$