Operating System (OS)
The Storage-to-Storage 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, expect in the case of store operation when it is also
None of these
have both their operands in the main store.
All of these
which perform indicated operations on two fast registers of the machine and have the result in one of the registers

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Operating System (OS)
Thrashing can be avoided if

None of these
the speed of I/O processor is increased
All of these
the pages, belonging to the working set of the programs, are in main memory
the speed of CPU is increased

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