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Consider a /ABC where A(1,3,2),B(-2,8,0)...

Consider a `/_ABC` where `A(1,3,2),B(-2,8,0)` and `C(3,6,7)` .If the angle bisector of `/_BAC` meets the line "BC" at "D" ,then the length of the projection of the vector `vec AD` on the vector `vec AC` is :

A

`(39)/(2sqrt(38))`

B

`(sqrt(38))/(2)`

C

`sqrt(19)`

D

`(37)/(2sqrt(38))`

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