The common-emitter amplifier is current gain and voltage gain, but no power gain. The correct option is 2).
By inverting, a common emitter amplifier operates. The input impedance is low. It has a high output impedance despite having a low input impedance.
When it serves as a current buffer, the common base circuit operates at its peak efficiency. It has the capacity to accept a low input impedance input current and transfer almost the same current to a greater output impedance.
Therefore, the correct option is 2) current gain and voltage gain, but no power gain.
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The question is incomplete. Your most probably complete question is given below:
1) current gain and power gain, but no voltage gain 2) current gain and voltage gain, but no power gain 3) voltage gain, current gain, and power gain 4) voltage gain and power gain, but no current gain.
