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Which statement about Azure region pairs is correct?
ARegion pairs are two regions that share the same physical datacenter for cost savings
BRegion pairs are a billing feature that doubles the cost of any resource deployed to either region
CRegion pairs are randomly chosen at deployment time by the customer's subscription owner
DRegion pairs are pre-defined pairs of regions in the same geography that Microsoft uses for cross-region replication and prioritised recovery during widespread outages
Answer & Solution
Correct answer: D. Region pairs are pre-defined pairs of regions in the same geography that Microsoft uses for cross-region replication and prioritised recovery during widespread outages
Microsoft defines region pairs (e.g. East US ↔ West US, Central India ↔ South India) so cross-region replication (GRS, geo-redundant SQL backups) has a stable, low-latency, in-geography target — and so that during a broad outage Microsoft prioritises restoring one region in the pair first. They aren't shared hardware, customer-chosen, or a billing construct.
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