Tricky question. Doesn't ask maximum number of nodes in a SAN cluster, it asks how many additional nodes can be added to an existing 4 node cluster. 12 - 4 = 8 additional nodes.
Maximum nodes in a cluster with SAN protocols is 12. The question asks how many nodes can be added to a 4 node cluster therefore the answer is 8.
Max nodes for each platform type and ONTAP version can be found in Hardware Universe. Instructions here:
https://docs.netapp.com/us-en/ontap/san-config/determine-supported-nodes-task.html
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