If d is the distance between the paralle...

If d is the distance between the parallel tangents with positive slope to `y^2=4x` and `x^2+y^2−2x+4y−11=0,`

A

`10ltdlt20`

B

`4ltdlt6`

C

`dlt4`

D

None of these

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The correct Answer is:

C

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