[Reference: https://docs.splunk.com/Documentation/ITSI/4.10.2/Configure/MetricsIndexRef, A is the correct answer because the itsi_summary_metrics index is used to store KPI values in ITSI. This index improves the performance of the searches dispatched by ITSI, particularly for very large environments. Every KPI is summarized in both the itsi_summary events index and the itsi_summary_metrics metrics index. References: Overview of ITSI indexes]