What additional information is needed to calculate the daily disk consumption, per indexer, if indexer clustering is implemented?

In an existing Splunk environment, the new index buckets that are created each day are about half the size of the incoming data. Within each bucket, about 30% of the space is used for rawdata and about 70% for index files.

What additional information is needed to calculate the daily disk consumption, per indexer, if indexer clustering is implemented?
A . Total daily indexing volume, number of peer nodes, and number of accelerated searches.
B . Total daily indexing volume, number of peer nodes, replication factor, and search factor.
C . Total daily indexing volume, replication factor, search factor, and number of search heads.
D . Replication factor, search factor, number of accelerated searches, and total disk size across cluster.

Answer: D