Rationalize the Denominator and Simplify $\frac { 4 } { \sqrt [ 4 ] { a ^ { 3 } } }$

Multiple Choice

Rationalize the denominator and simplify. Assume that all variables represent positive real numbers.
- $\frac { 4 } { \sqrt [ 4 ] { a ^ { 3 } } }$

A) $4 \sqrt [ 4 ] { a }$
B) $\frac { 4 \sqrt [ 4 ] { a ^ { 3 } } } { a }$
C) $\frac { 4 \sqrt [ 4 ] { a } } { a }$
D) $\frac { 4 \sqrt [ 4 ] { a ^ { 2 } } } { a }$