A Linux administrator edits a file that a system uses during the startup process to mount all the required partitions and volumes. The administrator wants to ensure no errors are in the file and the…

`fsadm` is a utility for filesystem administration tasks like resizing or checking filesystem consistency, not for validating the mount entries in `/etc/fstab`.

The `mount -a` command attempts to mount all filesystems listed in `/etc/fstab` that are configured to be mounted automatically (i.e., contain the 'auto' option and have a non-zero pass number). This action effectively validates the `/etc/fstab` entries and reports any errors or misconfigurations, ensuring the system can restart properly.

`fsck -N` performs a dry-run check of filesystem consistency on devices, but it does not validate the syntax or mountability of entries specified in the `/etc/fstab` file.

`mountpoint -d` is used to check if a specific directory is a mount point, which is irrelevant for a comprehensive validation of all entries within the `/etc/fstab` file.