Correct Answer: BTo allow administrators to authenticate directly to enable privilege mode via Telnet using a local username and password, the correct additional configuration is to create a local username with a privilege level of 15 and set a password for it. Then, use the 'login local' command on the vty lines to enable local authentication. This ensures that when administrators connect via Telnet, they can authenticate locally and gain privileged access. Therefore, the appropriate commands are creating a local user with privilege level 15, configuring the vty lines, and applying 'login local'. This configuration makes option B the correct choice.