A) \[\mathbf{a}=\mathbf{0}\]
B) \[\mathbf{b}=\mathbf{0}\]
C) Not parallel
D) None of these
Correct Answer: D
Solution :
\[\mathbf{a}\times \mathbf{b}=\mathbf{0},\] even if \[\mathbf{a}\ne \mathbf{0},\,\,\mathbf{b}\ne \mathbf{0}\] i.e., \[\mathbf{a}\] and \[\mathbf{b}\] are parallel.
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