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If the middle points of sides BC, CA and AB of triangle ABC are respectively D,E ,F then position vector of centre of triangle DEF, when position vector of A, B , C are respectively `hati + hatj, hatj + hatk , hatk + hati ` is

A

`1/3 (hati +hatj + hatk)`

B

`(hati +hatj + hatk)`

C

`2 (hati + hatj + hatk)`

D

`2/3 (hati + hatj +hatk)`

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The correct Answer is:
D
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