Which Cosmos DB conflict resolution policy is used when multiple regions write to the same item simultaneously?
- A First Write Wins
- B Last Write Wins (LWW) using a configurable property, or custom merge procedure (correct answer)
- C Manual resolution only
- D Newest timestamp always wins
Shortcut: Last Write Wins uses a user-defined numeric property (default _ts) to determine which write survives. Custom conflict resolution uses a stored procedure for merge logic.