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If a vector `(2hati+3hatj+ 8hatk)` is perpendicular to the vector `(4hatj-4hati+alpha hatk)`, then find the value of `alpha` is

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If a vector `(2hati+3hatj+ 8hatk)` is perpendicular to the vector `(4hatj-4hati+alpha hatk)`, then find the value of `alpha` is
A. -1
B. `1//2`
C. `-1//2`
D. `1`
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`(2hati+3hatj+8hatk)*(4hatj-4hati+alpha hatk)=0
`-8+12+ 8alpha =0 rArr 8alpha =-4`
`" "alpha = -1//2`
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