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

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

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Operating System (OS)
Trojan-Horse programs

are legitimate programs that allow unauthorized access
are hidden programs that do not show up on the system
usually are immediately discovered
do not usually work
None of these

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Operating System (OS)
The Register - to - Register (RR) instructions

which perform indicated operations on two fast registers of the machine and leave the result in one of the registers.
have both their operands in the main store.
None of these
All of these
which perform an operation on a register operand and an operand which is located in the main store, generally leaving the result in the register, except in the case of store operation when it is also

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