If a Hard Fork Occurs on a Public Blockchain Software

Multiple Choice

If a hard fork occurs on a public blockchain software and 20 running nodes choose not to update, what can be said about those 20 nodes?

A) They are effectually now operating on a different blockchain network than the nodes that updated
B) They are considered "out of compliance"
C) They are flagged for removal from the network and can no longer collect fees
D) They are unable to achieve consensus