Adding the third-party application's server IP address to the list of trusted hosts in Tableau Server For trusted authentication to function correctly, it is crucial to add the third-party application's server IP address to Tableau Server's list of trusted hosts. This step ensures that Tableau Server recognizes and accepts authentication requests from this specific application, enhancing security by limiting access to known, trusted sources. Option A is incorrect because setting up a VPN tunnel is not a standard requirement for configuring trusted authentication in Tableau Server. Option C is incorrect as configuring default administrative privileges for all users is unrelated to trusted authentication and poses a security risk. Option D is incorrect because enabling CORS for all domains is not directly related to the configuration of trusted authentication and could intro-duce security vulnerabilities.