What options are available for global notifications that pop up in Zabbix?

The correct response highlights the available actions related to global notifications in Zabbix, specifically focusing on managing alarm sounds. In Zabbix, users can choose to silence all currently active alarm sounds, as well as mute or unmute not only the current sounds but also any future alarm sounds. This capability enables users to have greater control over alarm management, particularly in environments where constant alerts may lead to distraction or hinder productivity.

In contrast, the other options address functionalities that are not part of global notifications. For example, changing alarm types and setting mute/unmute are not exclusively tied to global features; similarly, sending SMS notifications and setting alarm frequencies relate to other aspects of the Zabbix notification system. Restricting user access and viewing alarm history pertains to user permissions and data management, rather than the direct handling of notifications or alerts. This distinction clarifies why the focus on managing alarm sounds is the most relevant and correct understanding of global notifications in Zabbix.