Q .     If `x = at^{2}` and `y = 2at`, then `\ frac {d^{2}y}{dx^{2}}` at `t = \ frac {1}{2}` is

BITSAT 2015
A

`\ frac {-2}{a}`

B

`\ frac {4}{a}`

C

`\ frac {8}{a}`

D

` frac {-4}{a}`

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