Splunk Enterprise licensing is based on the amount of data that is ingested and indexed by the Splunk platform per day1. The data that counts against the license is the data that is stored in the indexes that are visible to the users and searchable by the Splunk software2. The indexes that are visible and searchable by default are the main index and any custom indexes that are created by the users or the apps3. The main index is the default index where Splunk Enterprise stores all data, unless otherwise specified4.
Option B is the correct answer because the data for the main index will count against the ingest-based license, as it is a visible and searchable index by default. Option A is incorrect because the summary index is a special type of index that stores the results of scheduled reports or accelerated data models, which do not count against the license. Option C is incorrect because the _metrics index is an internal index that stores metrics data about the Splunk platform performance, which does not count against the license. Option D is incorrect because the _introspection index is another internal index that stores data about the impact of the Splunk software on the host system, such as CPU, memory, disk, and network usage, which does not count against the license.
[References:, 1: How Splunk Enterprise licensing works - Splunk Documentation 2: What data counts against my license? - Splunk Documentation 3: [About indexes and indexers - Splunk Documentation] 4: [The main index - Splunk Documentation] : [Summary indexing - Splunk Documentation] : [About metrics indexes - Splunk Documentation] : [About the Monitoring Console - Splunk Documentation], , , , ]
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