The correct answer is:
x = a(y-v)²+h
Explanation:
Vertex form of a parabola differs depending on the direction the parabola opens. If it opens up or down, the equation is y = a(x-h)²+v, where (h, v) is the vertex.
If, however, the parabola opens left or right, the equation is x = a(y-v)²+h, where (h, v) is the vertex.
