What is the effect of the barometric settings on the pilot and copilot altimeters on MODE C altitude transmission?

In the context of MODE C altitude transmission, the barometric settings on the pilot and copilot altimeters do not influence the transmitted altitude information. The aircraft's transponder, which is responsible for transmitting altitude data, utilizes a standardized pressure setting that is typically referenced to a common regional altimeter setting, rather than depending on the individual settings of the pilot or copilot altimeters. This means that regardless of how each altimeter is set, the transponder transmits altitude relative to the standard pressure setting. Consequently, individual discrepancies in altimeter settings do not affect the altitude information transmitted by MODE C. Therefore, the statement that neither pilot altimeter setting has an effect accurately captures the relationship between altimeter settings and altitude transmission in this context.