Which of the following is true when a file system, which is neither listed in /etc/fstabnor known to system, is mounted manually?

Which of the following is true when a file system, which is neither listed in /etc/fstabnor known to system, is mounted manually?
A . systemd ignores any manual mounts which are not done using the systemctl mountcommand
B . The command systemctl mountsynccan be used to create a mount unit based on the existing mount
C . systemd automatically generates a mount unit and monitors the mount point without changing it
D . Unless a systemd mount unit is created, systemd unmounts the file system after a short period of time
E . systemctl unmountmust be used to remove the mount because system opens a file descriptor on the mount point

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Answer: B