Explanation
According to the Splunk Enterprise Security documentation, the default ports that must be configured for Splunk Enterprise Security to function are the following:
SplunkWeb (8000): This port provides the socket for Splunk Web, the web interface for Splunk Enterprise Security. It allows you to access the dashboards, reports, alerts, and other features of Splunk Enterprise Security from your browser. You can change this port in the web.conf file or by using the splunk set web-port command.
Splunk Management (8089): This port is used to communicate with the splunkd daemon, the main process that runs Splunk Enterprise Security. Splunk Web talks to splunkd on this port, as does the command line interface, and any distributed connections from other servers. This port also provides the REST API endpoint for Splunk Enterprise Security. You can change this port in the server.conf file or by using the splunk set splunkd-port command.
KV Store (8191): This port is used by the KV Store, a MongoDB-based service that stores key-value pairs of data for Splunk Enterprise Security. The KV Store is used to store and manage data for various features of Splunk Enterprise Security, such as asset and identity correlation, threat intelligence, adaptive response, and investigations. You can change this port in the server.conf file.
Therefore, the correct answer is C. SplunkWeb (8000), Splunk Management (8089), KV Store (8191).
References =
Change default values
KV Store overview