In the U1900 series unified gateways, regarding the relationship between prefix, office direction, office direction selection code and trunk, the correct statement is () multiple selection

In the U1900 series unified gateways, regarding the relationship between prefix, office direction, office direction selection code and trunk, the correct statement is () multiple selection
A . One prefix can only correspond to one office direction selection code
B . One office route selection code can only correspond to one prefix
C . The correspondence between office direction selection code and office direction is one­to-many
D . One office route can correspond to multiple different types of relays

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Answer: A,C