Two Cosmos regions concurrently update the same account balance. A proposal uses last-write-wins and claims both financial changes are merged. What should change?

Choose the single best answer.

A.Accept the proposal because last-write-wins sums all concurrent balances
B.Add read-only regions and assume transaction scope becomes global
C.Use eventual consistency as a replacement for accounting conflict rules
D.Define supported business conflict/ownership logic because last-write-wins can discard one update instead of merging accounting effects

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✓ Correct answer

Define supported business conflict/ownership logic because last-write-wins can discard one update instead of merging accounting effects

LWW selects a winning update; it is not an accounting merge. Business invariants require appropriate conflict/serialization/idempotency design. Read consistency and replica count do not supply missing merge semantics or arbitrary global transactions. Source guide: PDF page 31,42.

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