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You have a durable subscriber, and the subscriber is down or not reachable when the message is  produced. Which two options regarding the expiry of these messages are true?（）
A:after the subscriber is unavailable for 10 minutes
B:when the subscriber is available
C:after the subscriber is unavailable for after an hour
D:are available until the specified time elapses
E:are expired instantly

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出自：Oracle认证

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