A parabola, with its vertex at (0,0), has a focus on the negative part of the y-axis.

Which statements about the parabola are true?

SELECT TWO OPTIONS

The directrix will cross through the positive part of the y-axis.
The equation of the parabola will be in the form y^2 = 4px where the value of p is negative.
The equation of the parabola will be in the form x^2 = 4py where the value of p is positive.
The equation of the parabola could be y^2 = 4x.
The equation of the parabola could be x^2 = -1/2y.