If g is the transconductance, r is the resistance due to channel length modulation and if M2 has channel length modulation but M1 doesn’t, what is the voltage gain at node x?

• A. (1/g || r) / (1/g + (1/g || r))
• B. (1/g || r) / (1/g + (1/g || 2r))
• C. (1/g || r) / (2/g + (1/g || r))
• D. (1/g || r) / (1/g + (2/g || r))