Operating System (OS)
Memory management is :

critical for even the simplest operating systems
None of these
not used on multiprogramming systems
replaced with virtual memory on current systems
not used in modern operating system

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

have both their operands in the main store.
None 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, expect in the case of store operation when it is also
which perform indicated operations on two fast registers of the machine and have the result in one of the registers
All of these

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