Cogeneration is the process of taking a waste product or process and producing heat and generating electricity from it at the same time. It could be collection of waste heat from the original generation of electricity or burning of biodiesel, ethanol or methane gas from sewer or cow dung. The only answer where electricity is using or creating heat and generating electricity power is A.
To make trade and banking easier. But also because coins have been used as means of control and propaganda since this very invention , Kaiser William I appeared in the coins.
