You can configure FC and FC-NVMe SAN hosts with single nodes through one or more fabrics. N-Port ID Virtualization (NPIV) is required and must be enabled on all FC switches in the fabric. You cannot directly attach FC or FC-NMVE SAN hosts to single nodes without using an FC switch.

Please update this mistake the answer is D

D, https://kb.netapp.com/onprem/ontap/da/SAN/Can_FC_initiators_direct_attach_to_ONTAP_systems

Answer 100% is D, though technically you can direct connect but you need to swap the fibers over, as one is in and one is out, without a switch, both sides send data down the same fiber.

D All the way for FC

FC protocol must use a FC Switch and not Ethernet

D its correct , when use FC protocol must use FC Switch and not Ethernet Switch. Also , Direct Attach are not supported.

I think the answer is A, because B, C, and D do not make sense at all.

Correct answer is D. Proof*: https://docs.netapp.com/us-en/ontap/san-config/configure-iscsi-san-hosts-single-nodes-reference.html#direct-attached-single-node-configurations -> You can configure iSCSI SAN hosts in a direct-attached, single-switch, or multi-switch environment. Proof: https://docs.netapp.com/us-en/ontap/san-config/configure-fc-nvme-san-hosts-single-nodes-reference.html#single-fabric-single-node-configurations -> You cannot directly attach FC or FC-NMVE SAN hosts to single nodes without using an FC switch.

I believe the answer is A

Ans is D

D must be the answer

I think D.