For the parabola x2=−12yx^2 = -12yx2=−12y, what is the coordinate of the focus?
(0,3)(0, 3)(0,3)
(0,−3)(0, -3)(0,−3)
(3,0)(3, 0)(3,0)
(−3,0)(-3, 0)(−3,0)