If the line px + qy =1m is a tangent to ...

If the line px + qy =1m is a tangent to the parabola `y^(2)` =4ax, then

A

`p^2-aq=0`

B

`p+aq^2=0`

C

`p-aq^2=0`

D

`p-2aq^2=0`

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The correct Answer is:

B

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