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If the motion of a particle in the $xy$-plane is described by the polar equation $r=4\cos{3\theta}$, which statement best describes the motion of the particle when $\theta=\cfrac{\pi}{7}$?

A

The particle is moving away from the origin.

B

The particle is moving toward the origin.

C

The particle is stopped.

D

There is not enough information to make any conclusions.

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