The Curvature of the Curve Given by the Vector Function $r$

Multiple Choice

The curvature of the curve given by the vector function $r$ is
$$\mathrm { k } ( t ) = \frac { \left| \mathbf { r } ^ { t } ( t ) \times \mathbf { r } ^ { tt } ( t ) \right| } { \left| \mathbf { r } ^ { t } ( t ) \right| ^ { 3 } }$$
Use the formula to find the curvature of $\mathbf { r } ( t ) = \left\langle \sqrt { 13 } t , e ^ { t } , e ^ { - t } \right)$ at the point $( 0,1,1 )$ .
Select the correct answer.

A) $\sqrt { 15 }$
B) $\frac { \sqrt { 2 } } { 15 }$
C) $15 \sqrt { 2 }$
D) $\frac { 15 } { \sqrt { 2 } }$
E) $\frac { \sqrt { 15 } } { 15 }$