Exam NS0-184 topic 1 question 23 discussion

C & D Controller swap it'snt correct its a process for replace a controller of same model 4 Node cluster can be possible but you need a Switch for cluster and the ha pairs must be in the same ontap version and suppose that the A250 is in a newest version due to 9.5 it's out of support. So it makes sense to me host-based migration SnapMirror you can configure with the newest versions of ontap

Controller upgrade is not supported from FAS8020 to A250 so A is wrong, https://docs.netapp.com/us-en/ontap-systems-upgrade/upgrade-arl-auto/decide_to_use_the_aggregate_relocation_guide.html#sys_commands_95_97_supported_systems B is also wrong because AFF A250 Metrocluster IP is supported on ONTAP 9.8 and later Correct is CD

C & D are always possible, so it must be these two

D only makes sense if the A250 is on 9.10 or lower since 9.5 can't talk to 9.11, which seems to be what the hardware comes with out of the box today. The 8020, however, CAN be upgraded to 9.8, which the A250 also supports and thus a 4 node cluster *could* be made if switches are available. So B/C/D are all valid answers depending on circumstances.

A250 not support 9.5