What are the focus and directrix of the parabola with the equation y = 1/2x^2
focus: (3, 0) ; directrix: y = -3
focus: (-3, 0) ; directrix: y = 3
focus: (0, 3) ; directrix: y = -3
focus: (0, -3) ; directrix: y = 3
focus: (3, 0) ; directrix: y = -3
focus: (-3, 0) ; directrix: y = 3
focus: (0, 3) ; directrix: y = -3
focus: (0, -3) ; directrix: y = 3