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Let vec a and vec b be two vectors along...

Let `vec a and vec b` be two vectors along diagonals of parallelogram having area `2sqrt2` Let angle between `veca and vecb` be acute `abs(veca)=1, abs(veca * vec b)=abs(veca xx vecb)`. If `vecc=2sqrt2(veca xx vecb)-2vecb` then an angle between `vecb and vecc` is

A

`pi/4` s

B

`-pi/4`

C

`(5pi)/6`

D

`(3pi)/4`

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