What do COP, EER, and SEER stand for, and how do they differ in representing system efficiency?

What do COP, EER, and SEER stand for, and how do they differ in representing system efficiency?

• A. COP = coefficient of performance; EER = energy efficiency ratio measured at a standard outdoor condition; SEER = seasonal energy efficiency ratio averaged over a set of conditions.
• B. COP measures energy use per hour; EER measures cooling output for a fixed input; SEER measures reflect humidity.
• C. COP, EER, and SEER are all the same metric.
• D. COP = energy input; EER = energy output; SEER = mechanical efficiency.

Answer: (A)