Correct option: (2)
Explanation:
The common base configuration in an amplifier, the output and input are in phase i.e. δ1 = 0. However in common–emitter amplifier output is out of phase with input and output lags behind input i.e. δ2 = -π.
The voltage gain in common–emitter configuration is more than in common–base configuration i.e. A1 > A2.