Let the vectors \[\overrightarrow{a}\] and \[\overrightarrow{b}\] be such that \[\left| \overrightarrow{a} \right|=3\] and \[\left| \overrightarrow{b} \right|=\frac{\sqrt{2}}{3}\], then \[\overrightarrow{a}\times \overrightarrow{b}\] is a unit vector, if the angle between \[\overrightarrow{a}\] and \[\overrightarrow{b}\] is (A) \[\frac{\pi }{6}\] (B) \[\frac{\pi }{4}\] (C) \[\frac{\pi }{3}\] (D) \[\frac{\pi }{2}\]