T8B10

What does the term LEO mean in reference to communication satellites?

1. ALow Energy Orbit, which conserves battery power
2. BLow Elevation Orbit, which appears close to the horizon from the earth station
3. CLow Equilibrium Orbit, which has a slightly unstable period
4. DLow Earth Orbit, which has a period of around 100 minutes

Pick an answer to check it.