Operating System (OS)
The total time to prepare a disk drive mechanism for a block of data to be read from it is

None of these
latency plus transmission time
latency plus seek time plus transmission time
latency
latency plus seek time

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Operating System (OS)
Trojan-Horse programs

do not usually work
are hidden programs that do not show up on the system
None of these
are legitimate programs that allow unauthorized access
usually are immediately discovered

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