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A (3,0,-1),B(2,10,6) and (1,2,1) are the...

A `(3,0,-1),B(2,10,6)` and `(1,2,1)` are the vertices of a triangle. M is the mid point of the line segment joining AC and G is a point on line segment BM dividing `2:1` ratio internally find `cos(angleGOA)`

A

`(2)/(sqrt(5))`

B

`(1)/(sqrt(15))`

C

`(1)/(sqrt(10))`

D

`(1)/(sqrt(3))`

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The correct Answer is:
B
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