Operating System (OS)
If you do not know which version of MS-DOS you are working with, which command will you use after having booted your operating system?

None of these
DIR command
FORMAT command
VER command
DISK command

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Operating System (OS)
System maintenance:

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

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Operating System (OS)
A public key encryption system

allows only the correct sender to decode the data
does not encode the data before transmitting it
None of these
allows anyone to decode the transmission
allows only the correct receiver to decode the data

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

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

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