I think it's cot(135°)
Step-by-step explanation:
Cot 135° = Cot (π/2 + 45)
and,
Cot (π/2+45)= -tan (45),
because when a trigonometric ratio is impressed by using π/2 the ratio should be changed its opposite like sin value turns into a cos value, tan value turns into cot and vise versa. Then as 135° is in the second sector that means π/2<135°<π. So it should be -tan(45°)
As tan-45°= -tan 45° i think the answer is second one aka cot(135°)