If the equation of one tangent to the ci...

If the equation of one tangent to the circle with centre at (2,-1) from the origin is ` 3 x + y = 0 ` , then the equation of the other tangent through the origin is

A

`3x - y = 0 `

B

` x + 3y = 0 `

C

` x - 3y = 0 `

D

` x + 2y = 0 `

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The correct Answer is:

C

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