A system administrator is configuring a systemd timer unit to start a backup service exactly 10 minutes after the system has finished booting. Which line should be included in the [Timer] section of the timer unit file?
OnCalendar=*:0/10
StartupSec=10min
OnUnitInactiveSec=10min
OnUnitActiveSec=10min
OnBootSec=10min
OnActiveSec=10min
The 'OnBootSec=10min' directive is the correct answer. It specifies the timer should wait for 10 minutes after the system has booted before activating the associated unit. The directive is part of the timer specification in systemd and is used to delay the start of a service relative to system boot time. Other directives like 'OnUnitActiveSec' and 'OnUnitInactiveSec' are related to the activation times based on when the unit was last activated or became inactive and are not related to the boot process, making them incorrect in this context.
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