I have a multiple choice question in my workbook, Im not sure what the answer might be. If anyone could tell me and explain why, that would be great.

The domain of the function y = tan x is:

a) x ∈ R

b) -1<x<1

c) x ≠ nπ, where N ∈1

d) x ≠(π/2)+nπ, where N ∈1

Please note:π= Pi!

Thank you!