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The set of real values of 'a' for which ...

The set of real values of 'a' for which at least one tangent to `y^(2)=4ax` becomes normal to the circle
`x^(2)+y^(2)-2ax-4ay+3a^(2)-0,` is

A

[1, 2]

B

`[sqrt2,3]`

C

R

D

`phi` (no set)

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The correct Answer is:
A, B, C
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