Discussion
In CMOS logic circuits the p-MOS transistor acts as :
Answer: B
The p-MOS transistors act as the pull-up network.
A CMOS gate has a pull-up network of p-MOS transistors between VDD and the output and a complementary pull-down network of n-MOS transistors between the output and ground. A p-MOS transistor conducts when its gate is low and passes a strong logic 1, so it is used to pull the output up to VDD; the n-MOS network passes a strong 0 and pulls it down.
The pull-down role belongs to the n-MOS transistors. In a properly designed CMOS gate neither network is a short to ground or a passive load; the p-MOS 'load' belongs to older pseudo-nMOS logic.
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