The vectors 2hati + 3hatj -4hatk and aha...

The vectors `2hati + 3hatj -4hatk` and `ahati+bhatj+chatk` are perpendicular when :

A

a = 2, b=3, c=-4

B

a = 4, b=4,c= 5

C

a = 4, b=4,c = - 5

D

a = 4,b= 3,c = -5

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