A system administrator is creating a systemd timer to start a backup service exactly 10 minutes after the machine has finished booting. Which line belongs in the [Timer] section of the unit file to meet this requirement?
OnUnitActiveSec=10min
OnCalendar=*:0/10
OnActiveSec=10min
OnBootSec=10min
OnBootSec=10min is the correct directive because it triggers the timer a specified period after the system booted. OnActiveSec=10min measures time from when the timer itself is activated-typically boot, but not always if the timer is started later. OnUnitActiveSec=10min and OnCalendar=*:0/10 relate to the last activation of the associated unit and wall-clock calendar events, respectively, so they do not guarantee a delay relative to boot.
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