The input signal given to a $C.E.$ amplifier having a voltage gain of $126$ is $V_i = 2 \cos \left(12 t + \frac{\pi}{3}\right)$. The corresponding output signal will be
- A$252 \cos \left(12 t + \frac{4 \pi}{3}\right)$
- B$252 \cos \left(12 t + \frac{\pi}{3}\right)$
- C$63 \cos \left(12 t + \frac{2 \pi}{3}\right)$
- D$2 \cos \left(12 t + \frac{5 \pi}{3}\right)$
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