Find a Unit Vector in the Opposite Direction of U $( - 8 , - 11,1 )$

Multiple Choice

Find a unit vector in the opposite direction of u. u = $( - 8 , - 11,1 )$

A) $\frac { 1 } { \sqrt { 20 } } ( - 8 , - 11,1 )$
B) $\frac { 1 } { \sqrt { 186 } } ( 8,11 , - 1 )$
C) $( - 8 , - 11,1 )$
D) $\sqrt { 186 } ( 8,11 , - 1 )$
E) $\sqrt { 20 } ( - 8 , - 11,1 )$