Operating System (OS)
Link encryption

None of these
is less secure than end-to-end encryption
can not be used in a public network
is used only to debug
is more secure than end-to-end encryption

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Operating System (OS)
File record length

depends upon the size of the file
should always be fixed
None of these
Should always be variable
should be chosen to match the data characteristics

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Operating System (OS)
System maintenance:

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

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