Solve, finding all solutions.tan x = -1 (Express your answer in radians.)

A.  + 2k? and   + 2k?, where k is any integer
B.  + 2k? and   + 2k?, where k is any integer
C.  + 2k? and   + 2k?, where k is any integer
D. 2k? and ? + 2k?, where k is any integer


Answer: C

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