Operating System (OS)
Four necessary conditions for deadlock to exist are: mutual exclusion, no-preemption, circular wait and

None of these
deadlock avoidance
hold and wait
buffer overflow
race around condition

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Operating System (OS)
Seeks analysis

is used for analyzing device busy problems
is used for analyzing control-unit busy problems
None of these
is used for analyzing paging problems
is only shown on real-time displays

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