Per the provided URL reference
In addition to the set of search head members that constitute the actual cluster, a functioning cluster requires several other components:
The deployer. This is a Splunk Enterprise instance that distributes apps and other configurations to the cluster members. It stands outside the cluster and cannot run on the same instance as a cluster member. It can, however, under some circumstances, reside on the same instance as other Splunk Enterprise components, such as a deployment server or an indexer cluster master node.
According to the Splunk documentation on search head clustering, a Deployer is an optional component that can be used to distribute app and configuration updates to the members of a search head cluster. Therefore, Option A is the correct answer to the question, "Which additional component is required for a search head cluster?"
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