What configuration is essential for the correct functioning of Zabbix server after the installation?

For the correct functioning of a Zabbix server after installation, all the specified configuration elements are indeed essential.

The server configuration file settings are crucial as they define how the Zabbix server operates, including parameters such as the database type, the IP address, and the port number which the server will use to communicate with the database. This configuration file serves as the backbone for the Zabbix server's operational parameters.

Database connection settings are equally important because they dictate how the Zabbix server connects to the database. The Zabbix server must be able to communicate with the database to store and retrieve monitoring data. If these settings are incorrect or not configured, the server will not be able to function properly, leading to data loss or failure in monitoring tasks.

Web server configuration is also critical, as it serves the Zabbix frontend to users. The web server must be properly configured to handle requests, serve the Zabbix interface, and propagate requests to the Zabbix server. This aspect ensures that users can interact with the Zabbix environment through their web browsers.

Thus, all these configurations work in tandem to ensure the seamless operation of the Zabbix server, making the choice that includes all of these elements the correct one