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If a focal chord of the parabola y^(2)=a...

If a focal chord of the parabola `y^(2)=a x` is `2 x-y-8=0` then the equation of the directrix is

A

`x+4=0`

B

`x-4=0`

C

`y-4=0`

D

`y+4=0`

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The correct Answer is:
A
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