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If the straigth line y=mx+c touches the ...

If the straigth line `y=mx+c` touches the circle `x^2+y^2-4y=0`,then the value of c will be

A

`1+sqrt(1+m^2)`

B

`1-sqrt(m^2+1)`

C

`2(1+sqrt(1+m^2))`

D

`2+sqrt(1+m^2)`

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