6. (9th "Hope Cup" Senior High School Competition) Let $T_{1}, T_{2}, T_{3}$ represent the smallest positive periods of the functions $\tan \frac{x}{\sqrt{2}}, |\cos x|$, $\sin \frac{x}{3}\left(\sin \frac{x}{3}+\cos \frac{x}{3}\right)$, respectively. Then
A. $T_{1}<T_{2}<T_{3}$
B. $T_{3}<T_{2}<T_{1}$
C. $T_{2}<T_{1}<T_{3}$
D. $T_{2}<T_{3}<T_{1}$