The linex/a+y/b=1 will touch the circle ...

The line`x/a+y/b=1` will touch the circle `x^2+y^2=c^2` if

A

1) `1/c=1/a+1/b`

B

2) `1/c^2=1/a^2+1/b^2`

C

3) `c^2=a^2+b^2`

D

4) `c=a+b`

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