Which of the Following Sets of Parametric Equations Constitute a Parametrization

Multiple Choice

Which of the following sets of parametric equations constitute a parametrization of the whole parabola y = x²?

A) (a) , (c) , and (e) only
B) (a) and (e) only
C) (a) , (b) , and (c) only
D) all of them
E) none of them