Which two design considerations should an architect take to minimize data duplication?

Universal Containers is looking to use Salesforce to manage their sales organization. They will be migrating legacy account data from two aging systems into Salesforce.

Which two design considerations should an architect take to minimize data duplication? Choose 2 answers
A . Use a workflow to check and prevent duplicates.
B. Clean data before importing to Salesforce.
C. Use Salesforce matching and duplicate rules.
D. Import the data concurrently.

Answer: B,C