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The pair of tangents from (2,1) to the c...

The pair of tangents from (2,1) to the circle `x^(2)+y^(2)=1` is

A

`3y^(2)-4xy+4x+2y-20=0`

B

`3y^(2)+4xy+4x-2y-5=0`

C

`3x^(2)-4xy-16x-8y+20=0`

D

`3x^(2)-4xy-16x+8y-20=0`

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The correct Answer is:
A
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