Explanation/Reference: https://docs.splunk.com/Documentation/ES/6.1.0/User/NetworkProtectionDomaindashboards

Explanation/Reference: https://docs.splunk.com/Documentation/ES/6.4.1/Install/InstallTechnologyAdd-ons

Explanation
Data models are the primary source of data for Enterprise Security dashboards. Data models provide a structured and consistent way of defining and retrieving data from indexes. Data models accelerate searches by using prebuilt summaries of the data. Data models also enable the use of the tstats command, which can perform statistical analysis on the data model summaries. Data models are mapped to the Common Information Model (CIM), which provides a common language for describing data across domains and technologies. References = About data models Use the Common Information Model in Splunk Web

Explanation
According to the Splunk Enterprise Security documentation, only users with the ess_admin role or the Manage All Investigations capability can delete an investigation. The investigation owner and collaborators can edit the investigation, but not delete it. Therefore, the correct answer is A. ess_admin users only.
References = Manage investigations in Splunk Enterprise Security