Which two actions should be taken to meet this requirement?

The marketing team at Universal Containers has a list of 400 leads they would like to upload to Salesforce. They need to avoid creating duplicate records.

Which two actions should be taken to meet this requirement? (Choose two.)
A . Utilize a Lead Matching Rule and corresponding Duplicate Rule to block newly created duplicate leads.
B . Use Data Loader’s update function to import leads and match to existing records based on e-mail address.
C . Enable Duplicate Matching in the Data Management section in Setup and activate the Lead-to-Lead scenario.
D . Upload the lead list using the Import Wizard and select a Matching Type to prevent duplicate lead creation.

Answer: AD