If A=(1, 1, 1), B=(1, 2, 3), C=(2, -1, 1...

If A=(1, 1, 1), B=(1, 2, 3), C=(2, -1, 1) be the vertices of a `DeltaABC`, then the length of the internal bisector of the angle 'A' is

A

`1/2`

B

`sqrt(3/2)`

C

`1/4`

D

2

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The correct Answer is:

B

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