Find the Curvature of the Curve R(t) $\kappa = \frac { 1 } { 6 }$

Multiple Choice

Find the curvature of the curve r(t) .
-r(t) = (10 + 6 cos 8t) i - (4 + 6 sin 8t) j + 3k

A) $\kappa = \frac { 1 } { 6 }$
B) $\kappa = \frac { 4 } { 3 }$
C) $\kappa = 6$
D) $\kappa = \frac { 1 } { 36 }$