Which two approaches should the manager take to achieve this goal?

A manager at Cloud Kicks is importing Leads into Salesforce and needs to avoid creating duplicate records.

Which two approaches should the manager take to achieve this goal? (Choose two.)
A . Acquire an AppExchange Lead de-duplication application.
B. Implement Salesforce Matching and Duplicate Rules.
C. Run the Salesforce Lead Mass de-duplication tool.
D. Create a Workflow Rule to check for duplicate records.

Answer: A,B