$A$ particle revolving in a circular path travels the first half of the circumference in $4 \ s$ and the next half in $2 \ s$. What is its average angular velocity?
- A$\frac{4 \pi}{9} \ rad/s$
- B$\frac{\pi}{6} \ rad/s$
- C$\frac{2 \pi}{3} \ rad/s$
- D$\frac{\pi}{3} \ rad/s$
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