Which command would be used to see the active configurations for mounted filesystems?

The command used to see the active configurations for mounted filesystems is the "mount" command. This command displays the currently mounted filesystems along with their mount points and options. When executed without any arguments, it presents a list of all active mounts on the system, showing how each filesystem is configured, including important details like the device being mounted, the mount point in the filesystem hierarchy, and the options that were supplied during mount.

The other choices serve different purposes:

• The "df" command provides information related to disk space usage for mounted filesystems but does not show the configuration details like the mount command does.
• The "fstab" file is a configuration file that contains static information about filesystems and their mount points but is not a command used to view currently active mounts.
• The "blkid" command is used to locate or print block device attributes, such as filesystem types or UUIDs, which does not directly convey information regarding the current mount configurations.

Thus, the "mount" command is the most appropriate choice for examining the active configurations of mounted filesystems.