Let A(4, 7, 8), B(2, 3, 4) and C(2,5,7)...

Let A(4, 7, 8), B(2, 3, 4) and C(2,5,7) be the vertices of `DeltaABC`. The length of the median AD is

A

`sqrt2`

B

`sqrt2/2`

C

`(sqrt77)/2`

D

`(sqrt89)/2`

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The correct Answer is:

C

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