Operating System (OS)
What is the name of the operating system which was originally designed by scientists and engineers for use by scientists and engineers?

UNIX
XENIX
MS DOS
None of these
OS/2

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Operating System (OS)
A public key encryption system

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

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