If A (-1, 4,2), B(3, -2, 0) and C(1,2,4)...

If `A (-1, 4,2), B(3, -2, 0) and C(1,2,4)` are the vertices of the triangle ABC, then the length of its median through the vertex A is-

A

5 unit

B

7 unit

C

`sqrt10` unit

D

`sqrt43` unit

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The correct Answer is:

A

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