$\text { Find the value of the derivative (if it exists) of } f ( x ) = ( x - 2 ) ^ { 4 / 5 } \text { at the indicated }$

Multiple Choice

$\text { Find the value of the derivative (if it exists) of } f ( x ) = ( x - 2 ) ^ { 4 / 5 } \text { at the indicated }$ extremum.

A) $f ^ { t } ( 2 )$ is undefined.
B) $f ^ { t } ( 2 ) = ( - 4 ) ^ { 4 / 5 }$
C) $f ^ { t} ( 2 ) = 0$
D) $f ^ { t} ( 2 ) = \frac { 4 } { 5 } ( 2 ) ^ { - 1 / 5 }$
E) $f ^ { t } ( 2 ) = ( 4 ) ^ { 4 / 5 }$