If channel length modulation is present in M1 but not in M2, what is the voltage gain at node X?

• A. (1/gm2 || ro2) / {1/gm2 + ( 1/gm1 || ro1)}
• B. (1/gm1 || ro1) / (1/gm2 + ro1)
• C. 1/gm1 / (1/gm2 + 1/gm1)
• D. 1/gm1 / {1/gm2 + (1/gm1 || ro1)}