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.

Answer: B,D,E