Which of the following should a systems administrator use to run the uptime command every ten seconds?

crontab does not accept a -n flag for intervals in seconds and cannot schedule sub-minute recurring tasks in this syntax.

watch is a utility that repeatedly runs a command and refreshes the terminal output at a defined interval. The -n10 flag sets the interval to 10 seconds, so watch -n10 uptime executes the uptime command every 10 seconds and displays the refreshed output continuously. This is the standard tool for periodic command execution in an interactive terminal session.

uptime has no -s10 flag for repeating execution; -s on uptime shows the time the system was last booted.

cron is a daemon and does not accept command-line arguments in this form to run a command on a seconds-based interval.

The time command measures execution duration of a single command run and has no -x10 flag for repetition.