Express the point given in Cartesian coordinates in cylindrical coordinates $(r, \theta, z)$.

A) $\left(7 \!\left( \frac{\sqrt{3}}{2} \right),\ 7 \!\left( \frac{1}{2} \right),\ -7\right) =$ ( ,, )

B)$\left(-7 \!\left( \frac{\sqrt{3}}{2} \right), 7 \!\left( \frac{1}{2} \right), -7\right)$ = $($,, $)$

C)$\left(7 \!\left( \frac{\sqrt{3}}{2} \right), -7 \!\left( \frac{1}{2} \right), -7\right)$ = $($,, $)$

D)$\left(-7 \!\left( \frac{\sqrt{3}}{2} \right), -7 \!\left( \frac{1}{2} \right), -7 \right)$ = $($,, $)$