Assume that the following requirement is to be implemented: If a U1900 user dials the number of a PSTN user, carrier A's trunk is preferred to route the call. When carrier A's network is faulty, carrier B's trunk is used to route the call. Assume that the office route selection code of carrier A is 1, and the office route selection code of carrier B is 2. In this case, which the following configurations is CORRECT?
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