Question

what should be its answer

Answer 1

it is certainly not A or B

Answer 2

since for example \((2,\frac{1}{2})\) belongs to A and not to B and \((2,-2)\) belongs to B and not to A

Answer 3

so what answer

Answer 4

i think you can try to solve
\[y=-x=\frac{1}{x}\] and see what happens

Answer 5

okay..