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The tangents at the points (a t(1)^(2), ...

The tangents at the points `(a t_(1)^(2), 2 a t_(1)), (a t_(2)^(2), 2 a t_(2))` are right angles if

A

`t_(1) cdot t_(2)=-1`

B

`t_(1) cdot t_(2)=1`

C

`t_(1) cdot t_(2)=2`

D

`t_(1) cdot t_(2)=-2`

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The correct Answer is:
A
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