Express the Vector as a Product of Its Length and Direction

Multiple Choice

Express the vector as a product of its length and direction.
- $\frac { 15 } { 7 } j + \frac { 8 } { 7 } \mathbf { k }$

A) $\frac { 17 } { 7 } \left( \frac { 15 } { 7 } \mathbf { j } + \frac { 8 } { 7 } \mathbf { k } \right)$
B) $\frac { 289 } { 49 } \left( \frac { 15 } { 7 } \mathbf { j } + \frac { 8 } { 7 } \mathbf { k } \right)$
C) $\frac { 17 } { 7 } \left( \frac { 15 } { 17 } \mathbf { j } + \frac { 8 } { 17 } \mathbf { k } \right)$
D) $\frac { 17 } { 7 } ( \mathbf { j } + \mathbf { k } )$