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The International Space Station is maintained in a nearly circular orbit with a mean altitude of $330 \, km$ and a maximum of $410 \, km$. An astronaut is floating in the space station's cabin. The acceleration of the astronaut as measured from the Earth is:
- Azero
- Bnearly zero and directed towards the Earth
- Cnearly $g$ and directed along the line of travel of the station
- Dnearly $g$ and directed towards the Earth
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