Which two additional input are required by Sizer?

When sizing for Splunk, the customer states the daily ingest rate is 500GB and they are

currently using Search Factor 2 and Splunk Replication Factor 2.

Which two additional input are required by Sizer? (Choose two)
A . Data Retention
B . Network Bandwidth
C . Number of Events
D . Number of Datastores
E . Concurrent Search Users

Answer: A,E