(1) Select all points that are equivalent in polar coordinates to $\left(2, \frac{\pi}{6}\right)$. Select one or more.
(a) $\left(-2, \frac{5\pi}{6}\right)$
(b) $\left(-2, \frac{13\pi}{6}\right)$
(c) $\left(2, \frac{13\pi}{6}\right)$
(d) $\left(-2, \frac{-7\pi}{6}\right)$
(e) All of the above choices.