Which of the following commands can be used to determine how long the system has been running? (Choose TWO correct answers.)

The `uptime` command is specifically designed to show the current time, how long the system has been running, the number of logged-in users, and the system load averages.

`up` is not a standard Linux command for displaying system uptime.

The `top` command provides a real-time view of running processes and system statistics, and its output header includes the system's uptime, among other details like current time and load averages.

`uname -u` is not a valid or standard option for the `uname` command and does not report system uptime.

`time up` is not a valid command to check system uptime; `time` is used to measure the execution duration of another command.