Let $f ( x ) = \ln \left( \log _ { 2 } x \right)$

Multiple Choice

Let $f ( x ) = \ln \left( \log _ { 2 } x \right)$ Then $f ^ { \prime } ( x )$ is

A) $\frac { 1 } { x \log _ { 2 } x }$
B) $\frac { \ln 2 } { x \log _ { 2 } x }$
C) $\frac { 1 } { x \ln x }$
D) $- \frac { 1 } { x \ln 2 ( \ln x ) }$
E) $\frac { \ln 2 } { x \ln x }$