Which three nodes should you identify?

You are designing an Apache HBase cluster on Microsoft Azure HDInsight.
You need to identify which nodes are required for the cluster.
Which three nodes should you identify? Each correct answer presents part of the solution.
NOTE: Each correct selection is worth one point.
A. Nimbus
B. Zookeeper
C. Region
D. Supervisor
E. Falcon
F. Head

Correct Answer: BCF
Explanation/Reference:
An Hbase cluster has the following nodes: Head server (2), region server (1+), master/ZooKeeper node (3).
Illustration:

Reference: https://docs.microsoft.com/en-us/azure/hdinsight/hdinsight-hadoop-provision-linux-clusters