Phase difference between output and input of a CE amplifier

1. A.
   $252\cos\!\left(12t + \frac{4\pi}{3}\right)$
2. B.
   $252\cos\!\left(12t + \frac{\pi}{3}\right)$
3. C.
   $63\cos\!\left(12t + \frac{2\pi}{3}\right)$
4. D.
   $2\cos\!\left(12t + \frac{5\pi}{3}\right)$

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1. A.
   $0^{c}$
2. B.
   $\frac{\pi^{c}}{2}$
3. C.
   $\frac{3\pi^{c}}{4}$
4. D.
   $\pi^{c}$

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