Find a Unit Vector in the Direction of the Given $\mathbf { u } = \langle 0 , - 4 \rangle$

Multiple Choice

Find a unit vector in the direction of the given vector. $\mathbf { u } = \langle 0 , - 4 \rangle$

A) $\langle - 1 , - 1 \rangle$
B) $\langle - 1,0 \rangle$
C) $\langle 0,0 \rangle$
D) $\langle 0 , - 1 \rangle$
E) $\langle 1,0 \rangle$