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Which of the following points lie on the...

Which of the following points lie on the parabola `x^2=4a y ?` a.`x=a t^2, y=2a t` b. `x=2a t ,\ y=a t^2` c. `x=2a t^2, y=a t` d. `x=2a t ,\ y=a t^2`

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option d
substituting `x=2at` and `y=at^2`
`x^2=4ay` `(2at)^2 = 4a(at^2)`
`4a^2t^2=4a^2t^2` ...
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