Which of the following statements are correct for basic transistor Amplifier configurations?

For good stabilized biasing of the transistor of the CE Amplifier of fig, we should have

Of the four biasing circuits shown in Fig. For a BJT, indicate the one which can have maximum bias stability:

The amplifier circuit shown below uses a compostie transistor of a MOSFET and BIPOLAR in cascade. ALL capacitance are large. gm of the MOSFET = 2 mA/V , and h_fe of the BIPOLAR = 99. The overall Transconductance g_m of the composite transistor is