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If `hati , hatj , hatk` are units vectors and `|veca| = a` , then the value of ` | hati xx |veca|"|"^2 + |hatj xx |veca|"|"^2 +| hatk xx |veca|"|"^2 ` is :

A

`a^2`

B

`3a^2`

C

`2a^2`

D

`4a^2`

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