If a parabola has its vertex at (0,0)(0,0)(0,0) and focus at (0,3)(0, 3)(0,3), what is its equation?
x2=3yx^2 = 3yx2=3y
y2=3xy^2 = 3xy2=3x
x2=12yx^2 = 12yx2=12y
y2=12xy^2 = 12xy2=12x