Indexing Is Slow and Real-Time Search Results Are Delayed in a Splunk

Indexing is slow and real-time search results are delayed in a Splunk environment with two indexers and one search head. There is ample CPU and memory available on the indexers. Which of the following is most likely to improve indexing performance?

A) Increase the maximum number of hot buckets in indexes.conf Increase the maximum number of hot buckets in indexes.conf
B) Increase the number of parallel ingestion pipelines in server.conf Increase the number of parallel ingestion pipelines in server.conf
C) Decrease the maximum size of the search pipelines in limits.conf Decrease the maximum size of the search pipelines in limits.conf
D) Decrease the maximum concurrent scheduled searches in limits.conf Decrease the maximum concurrent scheduled searches in