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If the line a x+b y=2 is a normal to the...

If the line `a x+b y=2` is a normal to the circle `x^2+y^2-4x-4y=0` and a tangent to the circle `x^2+y^2=1` , then `a=1/2,b=1/2` `a=(1+sqrt(7))/2` , `b=(1+sqrt(7))/2` `a=1/4,b=3/4` (d) `a=1,b=sqrt(3)`

A

`a = 1/2, b = 1/2`

B

`a = (1 + sqrt7)/(2), b = (1 - sqrt7)/(2)`

C

`a = 1/4, b = 3/4`

D

a = 1, `b = bar 3`

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