which function's graph has asymptotes located at the values x=pi/2+-npi?1. y = sin x2. y = sec x3. y = cot x4. y = tan x A) 2 onlyB) 1 onlyC) 1 and 3 onlyD) 2 and 4 only

For those of you with differently ordered answers, the correct answers according to Apex are as followed:  y=sec x  and  y=tan x