Users in the sales department are unable to create new files in the shared directory /Sales. A junior Linux administrator determines the permissions on the /Sales directory are set to rwxr-----, and…

`umask 002` sets the default permissions for newly created files and directories for a user, but it does not modify the permissions of an existing directory.

The `chmod 770 /Sales` command changes the directory permissions to `rwxrwx---`. This grants read, write, and execute permissions to the file owner and the group ('sales'), while denying all permissions to others, thereby enabling group members to create new files.

`chmod g+s /Sales` sets the Set Group ID (SGID) bit, causing new files to inherit the directory's group, but it does not grant write permission to the group on the directory itself.

`chmod 777 /Sales` would grant read, write, and execute permissions to all users, which is an unnecessary security risk as only the 'sales' group requires write access.