If \( u \) and \( v \) are unit vectors and \( \theta \) is the acute angle between them, then \...

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If \( u \) and \( v \) are unit vectors and \( \theta \) is the acute angle between them, then \( 2 u \times 3 v \) is a unit vector for
(a) exactly two values of \( \theta \)
(b) more than two values of \( \theta \)
(c) no value of \( \theta \)
(d) exactly one value of \( \theta \)
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