$\text { Find the derivative of the function } f ( x ) = \operatorname { arcsec } ( 9 x ) \text {. }$

Multiple Choice

$\text { Find the derivative of the function } f ( x ) = \operatorname { arcsec } ( 9 x ) \text {. }$

A) $-\frac { 1 } { | 9 x | \sqrt { 81 x ^ { 2 } - 1 } }$
B) $\frac { 1 } { | x | \sqrt { 81 x ^ { 2 } - 1 } }$
C) $\frac { 1 } { | 9 x | \sqrt { 81 x ^ { 2 } - 1 } }$
D) $\frac { 1 } { \sqrt { 81 x ^ { 2 } + 1 } }$
E) $- \frac { 1 } { | x | \sqrt { 81 x ^ { 2 } - 1 } }$