Question $21$

$1\mathrm{.}25$ Points

The first and simplest recovery method, and the most drastic, is to

select a nondeadlocked job, preempt the resources it's holding, and allocate them to a deadlocked process so it can resume execution, thus breaking the deadlock

identify which jobs are involved in the deadlock and terminate them one at a time, checking to see if the deadlock is eliminated after each removal

terminate only the jobs involved in the deadlock and ask their users to resubmit them

terminate every job that's active in the system and restart them from the beginning