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Consider a family of circles which are passing through the point (-1,1) and are tangent to X-axis. If (h,k) are the coordinate of the centre of the circles, then the set of vaues of k is given by the interval

A

`k ge 1/2`

B

`-1/2 le k le1/2`

C

`k le 1/2`

D

`0ltklt1/2` .

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