For real numbers x and y, such that xy ≠ 0, the following functions are defined.f(x, y) = if x + y > 0 and f(x, y) = (x + y)^2 otherwise.g(x, y) = (x + y)^2 if x+y <0 (not less than 0)and g(x, y) = -( x + y) otherwise.
In which of the following cases is f(x, y) > g (x, y) necessarily true?

1) x > 0, y > 0
2) x < 0, y < 0
3) x > 0, y < 0
4) None of the above