An account system requires ordered updates per account and independence between accounts. It must also avoid duplicate effects after redelivery. Which two measures fit? Select 2 answers.

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A.Put all accounts into one session to maximize independent parallelism
B.Treat duplicate detection as guaranteed exactly-once external execution
C.Enforce idempotency using stable business identifiers
D.Use Receive and Delete to recover automatically after consumer crashes
E.Assign related messages the same account-scoped SessionId

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Enforce idempotency using stable business identifiers
Assign related messages the same account-scoped SessionId

Account-scoped sessions provide the required local ordering, and idempotency protects repeated business processing. One global session serializes unrelated accounts, duplicate detection does not guarantee external execution exactly once, and Receive and Delete loses the message before processing recovery is assured. Source guide: PDF page(s) 50-51.

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