Suppose that the temperature at a point (x, y) on the floor of a room is given by T(x, y). Suppose heat is being radiated out from a hot spot at the origin. Which of the following could be VT(a,b), where a, b>0?
[A] (2, 2)
[B] (-2, 2)
[C] (2,-2)
[D] (-2, -2)