Which of the following can be the parametric equation of x2 = 4ay
There can be more than one parametric representation of a given parabola. One condition is that it should be able to represent all points and should satisfy the curves equation.
So by substituting the given options, we get B and C as correct. That is (2at, at2) and (−2at, at2) are parametric representations of x2 = 4ay