Create an ext$4$ file system on $/$dev$/$sdb$1$ by using the mkfs command.

Expand this content if you need help:

Check the man page for mkfs if you aren't sure of the syntax.

Use the $-$f option with lsblk to verify that you successfully created an ext$4$ file system on $/$dev$/$sdb$1.$

Confirm that you created an ext$4$ file system on $/$dev$/$sdb$1.$