Which of the following statements best compares nuclear power and geothermal energy based on their rates of renewal?

Nuclear power has a faster rate because all elements present in Earth's crust are spontaneously radioactive and are potential nuclear fuels.
Nuclear power has a slower rate because the nuclear waste produced is not radioactive and thus cannot be used further as a fuel.
Geothermal has a slower rate because the average temperature of the core of Earth is gradually lowering.
Geothermal energy has a faster rate because there is a continuous flux of heat from Earth's core.