Which of the following statements describe the matching rules for data ingestion? Note: There are 3 correct answers to this question.

Which of the following statements describe the matching rules for data ingestion? Note: There are 3 correct answers to this question.
A . System-defined rules can be deleted for the Unified Customer Profile.
B. System-defined rules can be edited for the Unified Customer Profile.
C. System-defined rules can be re-ordered for the Contextual Profile.
D. User-defined rules can be based on the firstName attribute.
E. System-defined rules are based on strongest identifier attributes.

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Answer: B,D,E