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OABC is a tetrahedron D and E are the mi...

OABC is a tetrahedron D and E are the mid points of the edges `vec (OA)` and `vec (BC)`. Then the vector `vec(DE)` in terms of `vec(OA), vec (OB) and vec(OC)`

A

`overline(OC)botoverline(AB)`

B

`overline(OC)=overline(AB)`

C

`overline(OC)=2overline(AB)`

D

`overline(OC)=overline(AB)`

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The correct Answer is:
A
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