Which of the Following Are True Statements About Splunk Indexer

Which of the following are true statements about Splunk indexer clustering?

A) All peer nodes must run exactly the same Splunk version.
B) The master node must run the same or a later Splunk version than search heads.
C) The peer nodes must run the same or a later Splunk version than the master node.
D) The search head must run the same or a later Splunk version than the peer nodes.