The line 2x-y+1=0 is tangent to the circ...

The line `2x-y+1=0` is tangent to the circle at the point (2, 5) and the center of the circle lies on `x-2y=4.` The radius of the circle is

A

`3 sqrt( 5)`

B

`4 sqrt( 5)`

C

`5 sqrt( 4)`

D

`5 sqrt( 3)`

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