The voltage gain of the amplifier shown as a two port network would be
1
\(\frac{1}{\left(1+R_1 C_1 S\right)\left(1+R_2 C_2 S\right)}\)
2
(1 + R1 C1 S) (1 + R2 C2 S)
3
\(\frac{R_1 C_1 S}{1+R_1 C_1 S+R_2 C_2 S}\)
4
\(\frac{1}{1+\mathrm{R}_1 \mathrm{C}_1 \mathrm{R}_2 \mathrm{C}_2 \mathrm{~S}^2}\)