Which of the following steps will make the Threat Activity dashboard the default landing page in ES?

Selecting the option that allows you to click the 'Set this as the default view' checkmark for the Threat Activity view is correct because it directly indicates that you are designating that specific view as the default landing page within the Enterprise Security (ES) application. This action communicates to the system that whenever users access the ES application, they should automatically be taken to the Threat Activity dashboard.

This process involves an explicit setting within the navigation configuration to mark the Threat Activity view as the primary interface users will see, ensuring a streamlined user experience focused on threat monitoring from the outset of their session. It essentially overrides any previous configurations or default views previously set and provides a clear and precise functionality for customizing user navigation experience within Splunk ES.