Electric Meters Can Run Backward for Homeowners Participating in Net

Electric meters can run backward for homeowners participating in net metering.What does this mean ?

A) homeowners receive meter credit for excess energy they generate and supply to the utility's power grid
B) the up front costs for installing renewable energy is recovered by rewinding the home's electric meter
C) if a homeowner uses less energy in one month than the previous month,then the difference is subtracted from the electric meter
D) homeowners who voluntarily cut back on air conditioning use are granted a electric credit
E) a radio controlled electric meter for remote monitoring allows the utility company to stop the meter during peak demand periods