What must be posted at the location of a station being operated by telecommand on or within 50 kilometers of the Earth’s surface?

When an amateur station is operated by telecommand (remotely) and is not a space station (meaning it is on or within 50 km of the Earth's surface), FCC rules require specific documentation to be physically posted at the transmitter site. This ensures accountability and provides immediate contact information in case the station causes interference. You must post a photocopy of the station license, as well as labels providing the name, address, and telephone number of both the station licensee and the control operator. Since all these pieces of information are mandated by the FCC for remote terrestrial stations, 'All these choices are correct' is the proper answer.