Find the Derivative Of $f ( x ) = \frac { 1 } { \sqrt [ 3 ] { x } }$

Multiple Choice

Find the derivative of $f ( x ) = \frac { 1 } { \sqrt [ 3 ] { x } }$

A) - $\frac { 1 } { 3 x ^ { 4 / 3 } }$
B) $\frac { 2 } { 3 }$ $x ^ { - 4 / 3 }$
C) $\frac { 5 } { 3 x ^ { 2 } }$
D) none of these