Operating System (OS)
If you want to execute more than one program at a time, the systems software you are using must be capable of:

virtual memory
multitasking
word processing
compiling
None of these

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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
None of these
allows only the correct receiver to decode the data
allows only the correct sender to decode the data

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