What is the equation of a parabola with Vertex (0 0) and focus (-3 0) a.y2-4x b.y2-12x c.y24x d.y212x?

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What is the equation of a parabola with Vertex (0 0) and focus (-3 0) a.y2-4x b.y2-12x c.y24x d.y212x?