What are the necessary requirements for node class compatibility when adding new nodes to an existing cluster?

What are the necessary requirements for node class compatibility when adding new nodes to an existing cluster?
A . Same node series, same amount of memory installed, and same back-end NIC port speed
B . Same number of HDDs, same node model, same OneFS version above 9.0
C . Same node series, same number of HDDs, same HDD and SSD layout
D . Same OneFS version above 9.0, same back-end NIC port speed, same SED, and SSD security settings

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Answer: C