What does the command mount -a do?

What does the command mount -a do?
A . It ensures that all file systems listed with the option noauto in /etc/fstab are mounted.
B . It shows all mounted file systems that have been automatically mounted.
C . It opens an editor with root privileges and loads /etc/fstab for editing.
D . It ensures that all file systems listed with the option auto in /etc/fstab are mounted.
E . It ensures that all file systems listed in /etc/fstab are mounted regardless of their options.

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Answer: D