Which of the following third-party applications can integrate with Zscaler's alert notifications?

ServiceNow is the correct choice because it is a widely used IT service management platform that provides workflows for incident management, problem management, and change management. Zscaler can integrate with ServiceNow to send alert notifications when specific events occur, such as a security incident or policy violation. This integration allows organizations to streamline their response processes and enhance their operational efficiency by allowing teams to act on alerts within a familiar interface.

Asana, Dropbox, and Trello, while useful tools, do not have the same level of integration capabilities with Zscaler's alert notifications as ServiceNow. Asana is primarily a project management tool, Dropbox is a file hosting service, and Trello focuses on task management and organization. None of these platforms are designed to handle IT alert notifications in the same manner as ServiceNow, which is specifically built for IT service management and can effectively manage workflow responses to alerts from Zscaler.