The locus of the centre of the circles w...

The locus of the centre of the circles which pass throguhg the centre of circle ` c_(1) : x^(2) + y^(2) = 1 ` and touches the circle `c_(2): x^(2) + y^(2) = 8 ` is

A

` x^(2) + y^(2) = 2 sqrt(2)`

B

` x^(2) + y^(2) = 2 `

C

` x^(2) + y^(2) = 4`

D

None of these

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The correct Answer is:

B

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