Answer:
if im not wrong im pretty sure its c but I would get a second opinion
[0,pi/2) and (pi/2, pi]
Step-by-step explanation:
The arc sec is valid in the range 0° ≤ y < 90° or 90° < y ≤ 180°
Converting to radians
It is not valid at pi/2 since there is an asymptote.
