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The locus of the mid-point of the line s...

The locus of the mid-point of the line segment joining the focus to a moving point on the parabola, `y ^(2 ) = 4ax ` is a conic. The equation of the directrix of that conic is

A

`y =a`

B

`x =a`

C

`y =0`

D

` x =0`

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The correct Answer is:
A
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