AD
Beginning with ONTAP 9.2, all inline storage efficiencies features, such as inline deduplication and inline compression, are enabled by default on AFF volumes.
Beginning with ONTAP 9.2, you can perform aggregate-level deduplication inline on AFF systems. The feature is enabled by default for all newly created volumes and all upgraded volumes with volume inline deduplication turned on.
AD
volume is default: https://docs.netapp.com/us-en/ontap/volumes/deduplication-data-compression-efficiency-concept.html
aggr is default: https://docs.netapp.com/us-en/ontap/volumes/manage-aggregate-level-deduplication-aff-task.html
It would not make sense to do both volume and aggregate level dedup. It's B and D, see https://docs.netapp.com/us-en/ontap/volumes/deduplication-data-compression-efficiency-concept.html
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