Which angles are coterminal with pi/6?

Question

Chose all answers that are correct.

A. 5pi/6
B.13pi/6
C.-5pi/6
D.-11pi/6

I think its A and C

Answer 1

2π is a full circle...so they end at the same place

π/6 + 2π = 13π/6

π/6 - 2π = -11π/6