Explanation
According to the Splunk Enterprise Security documentation, the best way to integrate a newly built custom dashboard to a team of security analysts in ES is to set the dashboard permissions to allow access by es_analysts and use the navigation editor to add it to the menu. This will ensure that the dashboard is visible and accessible to the users with the es_analyst role, which is the default role for security analysts in ES. The navigation editor allows you to customize the menu bar of ES and add links to custom dashboards, reports, or other views. See Customize Splunk Enterprise Security dashboards to fit your use case and Customize the navigation bar for more details.
The other options are not recommended, because they either do not integrate the dashboard properly or they create unnecessary complexity. Adding links on the ES home page to the new dashboard is not a good option, because it does not integrate the dashboard into the menu bar and it may clutter the home page. Creating a new role inherited from es_analyst, making the dashboard permissions read-only, and making this dashboard the default view for the new role is not a good option, because it creates a redundant role and it may confuse the users who expect to see the Security Posture dashboard as the default view. Adding the dashboard to a custom add-in app and installing it to ES using the Content Manager is not a good option, because it requires creating and maintaining a separate app and it may cause conflicts or performance issues with ES. Therefore, the correct answer is C. Set the dashboard permissions to allow access by es_analysts and use the navigation editor to add it to the menu. References = Customize the navigation bar Roles and capabilities in Splunk Enterprise Security Content Management Customize Splunk Enterprise Security dashboards to fit your use case How to Create Custom Dashboards and Alerts to Achi ... - Splunk Community