\(\frac{2}{3}\)
2
3
\(\frac{3}{2}\)
Correct answer is D
For perpendicular vectors, their dot product = 0.
\((4i - kj). (3i + 8j) = 12 - 8k = 0\)
\(8k = 12 \implies k = \frac{3}{2}\)
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