Which statement is true about an external id field? Choose 2 answers

Which statement is true about an external id field? Choose 2 answers
A . The field must be unique since duplicates are not allowed within salesforce
B . The field can be unique based on case-sensitive or case-insensitive values.
C . The field must contain at least one number and at least one letter
D . The field contains unique records identifiers from a system outside of salesforce

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Answer: A,D