pre calc/trig question? help please?

[singergirl23]

Evaluate arccsc2

A. {pi/6, 5pi/6}
B. pi/3
C. {pi/6 +/- 2pin, 5pi/6 +/- 2(pi)n}
D. {pi/3 +/- 2(pi)n, 5pi/3 +/- 2(pi)n}