Which of the following lines is a tangen...

Which of the following lines is a tangent to the circle `x^2+y^2=25` for all values of m?

A

`y=mx+25sqrt(1+m^2)`

B

`y=mx+5sqrt(1+m^2)`

C

`y=mx+25sqrt(1-m^2)`

D

`y=mx+5sqrt(1-m^2)`

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