Which three areas of Salesforce should the architect review before proposing any design recommendation?

A data architect has been tasked with optimizing a data stewardship engagement for a Salesforce instance.

Which three areas of Salesforce should the architect review before proposing any design recommendation? Choose 3 answers
A . Review the metadata xml files for redundant fields to consolidate.
B . Determine if any integration points create records in Salesforce.
C . Run key reports to determine what fields should be required.
D . Export the setup audit trail to review what fields are being used.
E . Review the sharing model to determine impact on duplicate records.

Answer: A,C,E