Which of the Following Describes an Example of How Cogeneration

Multiple Choice

Which of the following describes an example of how cogeneration systems work?

A) A hybrid system uses both renewable and nonrenewable resources.
B) A system is run with an energy-efficient, digitally controlled, UHV system/transmission lines.
C) A system uses variable-speed electric motors.
D) Heat left over from power generation can be captured and used to heat a building.
E) A system generates energy flexibly through a combination of resources.