Math - Trig

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For the equation 4 cos theta - square root 12 = 0, where 0 < theta < (or equal to) 2 pi, determine the measure of theta.
The answers to choose from are:
A) pi/ 3, 5 pi/ 3
B) 2 pi/ 3, 4 pi/ 3
C) 5 pi/ 6, 7 pi/ 6
D) pi/ 6, 11 pi/ 6

Please explain and show work, because I don't understand how to do this question, or get answers like that.

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