The correct answer is: System Time.
The time command is used to display the current system time. The system time is the time that is kept by the computer’s hardware clock. It is usually synchronized with a time server, such as a Network Time Protocol (NTP) server.
US time is the time zone that is used in the United States. It is 8 hours behind Coordinated Universal Time (UTC).
Greenwich Mean Time (GMT) is the time zone that is used in Greenwich, England. It is the same as UTC.
Julian time is a timekeeping system that is based on the Earth’s rotation. It is not used in everyday life.