Operating System (OS)
The term 'polling' in a computer means a process by which a computer system

detects/corrects errors
inquires to see if a terminal has any transaction to send
multiplexes the inputs and updates the memory accordingly
None of these
decides correct alternative by analysing several ones

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Operating System (OS)
File record length

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

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Operating System (OS)
Trojan-Horse programs

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

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