In U1900 series unified gateway, which of the following statements are CORRECT about the relationships among prefixes, office routes, office route selection codes, and trunks for eSpace U1900? (Multiple Choice)
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A prefix can map only one office route selection code.
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An office route selection code can map only one prefix.
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Office route selection codes and office routes have a one-to-many relationship.
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An office route can map the trunks of different types.