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The line x-2 y+4 a=0 is a tangent to the...

The line `x-2 y+4 a=0` is a tangent to the parabola `y^(2)=4 a x` at

A

`(2 a, 2 a)`

B

`(3 a, 3 a)`

C

`(a, a)`

D

`(4 a, 4 a)`

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The correct Answer is:
D
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