Linux
The command chmod 761 letter is equivalent to

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

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Linux
RPM

is used to keep track of the users
assigns a dynamic IP address
stands for Red Hat Package Manager
is used to install, uninstall, and manage packages
None of these

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