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In the circuit shown in the figure , the channel length modulation of all transistors is non-zero $(\lambda\neq0)$. Also, all transistors operate in saturation and have negligible body effect .The ac small signal voltage gain ($V_o/V_{in}$) of the circuit is _________

1. $-g_{m1} \left(r_{o1}\mid\mid r_{o2}\mid\mid r_{o3} \right)$
2. $-g_{m1} \left (r_{o1}\mid\mid \frac{1}{gm3}\mid\mid r_{o3} \right )$
3. $-g_{m1} \left (r_{o1}\mid\mid \left( \frac{1}{gm2}\mid\mid r_{o2} \right)\mid\mid r_{o3} \right )$
4. $-g_{m1}(r_{o1}\mid\mid \left (\frac{1}{gm3}\mid\mid r_{o3})\mid\mid r_{o2} \right )$