Operating System (OS)
The Storage-to-Storage instructions

have both their operands in the main store.
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
All of these
None 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)
System maintenance:

always requires several programs
is not required if the system is well written
is usually not necessary
is necessary on all systems, regardless of how good
None of these

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