Consider the hierarchy of classes shown below. 
Which represent valid class headers that would be found in this hierarchy?
Definitions:
Geothermal Heat Pumps
Systems that use the stable underground temperature to provide heating, cooling, and hot water for buildings.
Geothermal Exchange
The process of using the Earth's constant underground temperature to heat and cool buildings.
Earth's Mantle
The thick layer of rock between the Earth's crust and core, making up about 84% of Earth's volume and involved in plate tectonic movements.
Sustainable Energy
Energy obtained from resources that are replenished at a rate equal to or faster than they are consumed, without depleting natural resources or harming the environment.
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