Find a Unit Vector in the Opposite Direction of U $( - 14 , - 3,14 )$

Multiple Choice

Find a unit vector in the opposite direction of u. u = $( - 14 , - 3,14 )$

A) $\frac { \sqrt { 31 } } { \sqrt { 401 } } ( - 14 , - 3,14 )$
B) $\sqrt { 401 } ( 14,3 , - 14 )$
C) $( - 14 , - 3,14 )$
D) $\frac { 1 } { \sqrt { 401 } } ( 14,3 , - 14 )$
E) $\frac { 1 } { \sqrt { 31 } } ( - 14 , - 3,14 )$