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【多选题】收单机构在与特约商户建立业务关系时，应采取以下哪些身份识别措施（）。
A.
留存特约商户有效身份证件的复印件或影印件
B.
对已建立业务关系的特约商户，可适当放宽身份识别措施
C.
登记特约商户身份基本信息
D.
核实特约商户有效身份证件
【多选题】Which two statements about the DiffServ model are true？ （）
A.
A class can be identified as a single application， multiple applications with similar service needs， or be based on the source or destination IP addresses.
B.
A drawback of the DiffServ model is that it does not provide backward compatibility with devices that can only use the ToS field.
C.
DiffServ uses the DiffServ field in the MAC header to mark frames into behavior aggregates （BAs）.
D.
The DiffServ field occupies the same eight bits of the MAC header that were previously used for the ToS field.
E.
The first six high-order bits of the DiffServ field are used to identify the Resource Reservation Protocol （RSVP） value.
F.
The primary goal of DiffServ is scalability.