If the vectors 2hati-3hatj+4hatk, 2hati+...

If the vectors `2hati-3hatj+4hatk, 2hati+hatj-hatk and lambdahati-hatj+2hatk` are coplanar, then the value of `lambda` is

A

5

B

6

C

`-5`

D

`-6`

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