Linux
The command chmod 761 letter is equivalent to

chmod a = 761 letter
chmod 4=7, g = 6, o = 1 letter
None of the listed here
chmod u = rwx, g = rw, o = x letter

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Linux
NIS

was formerly known as yellow pages
is a simple directory service whose main purpose is to allow remote authentication of systems on local network systems
allows configuration-such as password and group files
is Network Information Service

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