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

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
None of these
have both their operands in the main store.
which perform indicated operations on two fast registers of the machine and leave the result in one of the registers.
All of these

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Operating System (OS)
What is the method of handling deadlocks?

All of these
Pretend that deadlocks never occur in the system
Allow the system to enter the deadlock state and then recover
Use a protocol to ensure that the system will never enter a deadlock state

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