Let veca=2hati=7hatj-hatk,vecb=3hati+5ha...

Let `veca=2hati=7hatj-hatk,vecb=3hati+5hatk` and `vec c=hati-hatj=2hatk`. let `vecd` be a vector which is perpendicular to both `veca` and `vecb`, and `vecc.vecd=12`. Then `(-hati+hatj-hatk).(vecc xx vecd)` is equal to

A

24

B

44

C

42

D

48

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