In which directory tree are files modified when changing kernel parameters using the command sysctl?

• A./proc/sys/
• B./lib/sys/
• C./sys/kernel/
• D./proc/kernel/
• E./sys/proc/

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What is the usable disk space of a RAID 5 array of five 18GB drives with one drive dedicated as a spare?

• A.72GB
• B.18GB
• C.90GB
• D.36GB
• E.54GB

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Which type of DNS record defines which server(s) email for a domain should be sent to?

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Fill in the blank.
Which directory contains system-specific systemd unit files? (Specify the full path to the directory.)

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A database application requires a maximum shared memory segment (shmmax) of 2GB (2147483648 Bytes). Which configuration file should be modified to set this kernel parameter permanently? (Specify the full name of the file, including path.)

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