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

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

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Operating System (OS)
Assembler language

is usually the primary user interface
requires fixed-format commands
None of these
is quite different from the SCL interpreter
is a mnemonic form of machine language

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