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If two parabolas y^(2)-4a(x-k) and x^(2)...

If two parabolas `y^(2)-4a(x-k)` and `x^(2)=4a(y-k)` have only one common point P, then the equation of normal to `y^(2)=4a(x-k)` at P is

A

`y+x=4a`

B

`y+x=2a`

C

`y+x=4`

D

`y+x=2`

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The correct Answer is:
A
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