If A(1,-1,-3),B(2,1,-2) and C(-5,2,-6) a...

If `A(1,-1,-3),B(2,1,-2) and C(-5,2,-6)` are the position vectors of the vertices of `DeltaABC`. The length of the bisector of its internal angle at A is `(lamdasqrt(10))/(4)`, then value of `lamda` is

A

`2/3sqrt(10)`

B

`3/4sqrt(10)`

C

`4/3sqrt(10)`

D

`3/2sqrt(10)`

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The correct Answer is:

B

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