For which values of (x) and (y) does ((xy)²) equal (x²y²)? For which values of (x) and (y) does ((xy)²) not equal (x²y²)?

a) ((x=y)); ((x ≠ y))

b) ((x=0, y=0)); ((x ≠ 0, y ≠ 0))

c) ((x=1, y=1)); ((x ≠ 1, y ≠ 1))

d) ((x=-1, y=-1)); ((x ≠ -1, y ≠ -1))