Which command is used to configure a new TACACS+ server on a Cisco device?

The command to configure a new TACACS+ server on a Cisco device is structured in such a way that it clearly identifies the server being added. The command starts with "tacacs server," which indicates that you are entering the configuration mode for specifying a TACACS+ server. Following this, you include the server name to uniquely identify the server you wish to configure.

This format allows for the clear establishment of the server parameters within the device's configuration. It aligns with Cisco's command syntax, which generally involves using verbs followed by specific keywords to invoke particular functionalities or configurations. By providing the server name directly after this command, the device knows which TACACS+ server is being configured and how to refer to it in subsequent configurations or commands.

The other options do not fit the established command syntax for Cisco devices. They either lack the necessary keywords or structure, rendering them ineffective for the intended purpose of configuring a TACACS+ server.