The value of a so that the sum of the sq...

The value of a so that the sum of the squares of the roots of the
equations `x^2-(a -2)x-a+1=0` assume the least value is

A

(a) `2`

B

(b) `1`

C

(c) `3`

D

(d) `0`

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The correct Answer is:

B

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