Determine the Values Of $c$ Such That $\| c \mathbf { u } \| = 2$

Multiple Choice

Determine the values of $c$ such that $\| c \mathbf { u } \| = 2$ , where $\mathbf { u } = 3 \mathbf { i } - 4 \mathbf { j } + 2 \mathbf { k }$ .

A) $c = \pm 2$
B) $\quad c = \pm \frac { 2 \sqrt { 29 } } { 29 }$
C) $c = \pm \frac { \sqrt { 29 } } { 2 }$
D) $c = \pm \frac { 1 } { 2 }$
E) $c = \pm \frac { \sqrt { 29 } } { 29 }$