Operating System (OS)
A public key encryption system

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

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Operating System (OS)
You should choose sleep option when

When computer gets hanged frequently. Let it sleep for some time
You are leaving for a very short time and want to resume you work shortly
You finish working and going to bed
The computer is tired after working for the whole day

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Operating System (OS)
Backups should be done

as several image copies, followed by an incremental
as several incrementals, followed by an image copy
weekly for most installations
daily for most installations
None of these

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