Find the equation of the circle which to...

Find the equation of the circle which touches the x-axis and whose center is (1, 2).

A

`x ^(2) +y^(2) -2x+4y+1=0`

B

`x ^(2) +y^(2) -2x-4y +1=0`

C

`x ^(2) + y ^(2) + 2x + 4y +1=0`

D

`x ^(2) +y^(2) + 4x +2y +4=0`

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The correct Answer is:

B

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