What is the purpose of a system mount unit?

What is the purpose of a system mount unit?
A . It is used by the command systemd-mount and allows users to mount partitions to mount points of their choice
B . It is used only to mount network file systems to local mount points. It cannot be used for local media
C . It is created by the command systemd-fstab-generator to integrate entries from /etc/fstab into the system boot process
D . It is used by the command mount when using system to mount and unmount file systems

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Answer: A