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If a straight line passing through the focus of the parabola `x ^(2) =4ay` intersects the parabola at the points `(x_(1) , y_(1)) and (x_(2), y_(2))` then the value of `x_(1)x_(2)` is-

A

`a ^(2)`

B

`-a^(2)`

C

`4a^(2)`

D

`-4a^(2)`

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The correct Answer is:
D
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