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

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

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Operating System (OS)
A public key encryption system

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

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Operating System (OS)
All of the following are task performed by the operating system except

Performing housekeeping task like file compression and disk defragmentation
Controlling the access that application program has to the CPU
Provides an interface for user to interact with computer
Managing hardware on the computer

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