Which one of the following represents forward bias diode ?

In a common emitter transistor amplifier the audio sgnal voltage across the collector is 3 V. The resistance of collector is 3 k$$\Omega $$. If current gain is 100 and the base resistance is 2 k$$\Omega $$, the voltage and power gain of the amplifier is

The given electrical network is equivalent to

For CE transistor amplifier, the aufio signal voltage across the collector resistance of 2 k$$\Omega $$ is 4 V. If the current amplification factor of the transistor is 100 and the base resistance is 1 k$$\Omega $$, then the input signal voltage is