What is the primary driver behind implementing indexer clustering in a customer’s environment?

A. To improve resiliency as the search load increases.
B. To reduce indexing latency.
C. To scale out a Splunk environment to offer higher performance capability.

D. To provide higher availability for buckets of data.

Reference: https://docs.splunk.com/Documentation/Splunk/8.1.0/Indexer/Howclusteredsearchworks