Operating System (OS)
In which addressing mode the effective address of the operand is the contents of a register specified in the instruction and after accessing the operand, the contents of this register is incremented to point to the next item in the list?

None of these
index addressing
indirect addressing
auto decrement
auto increment

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Operating System (OS)
The advantage of a command processor running only built-in commands is:

None of these
the command set being common across different hardware configurations
the processing is much faster than would other-wise be the case when user defined commands are used
flexibility to the users in running lists of commands by simply collecting them in named batch command files
users can create system programs and run them as commands

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