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(C) 2 45. Three concentric circles of wh...

(C) 2 45. Three concentric circles of which the biggest is `x^2+ y^2= 1`, have their radii in A.P If the line `y= x+1` cuts all the circles in real and distinct points. The interval in which the common difference of the A.P will lie is:

A

`d lt (2- sqrt2)/(4)`

B

`d gt (2 + sqrt2)/(4)`

C

`d gt 1 + (1)/(sqrt2)`

D

d is any real number

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The correct Answer is:
A
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