What two solutions should UC implement to cleanse their data?

Universal Containers (UC) has multi -level account hierarchies that represent departments within their major Accounts. Users are creating duplicate Contacts across multiple departments. UC wants to clean the data so as to have a single Contact across departments.

What two solutions should UC implement to cleanse their data? Choose 2 answers
A . Make use of a third -party tool to help merge duplicate Contacts across Accounts.
B. Use Data.com to standardize Contact address information to help identify duplicates.
C. Use Workflow rules to standardize Contact information to identify and prevent duplicates.
D. Make use of the Merge Contacts feature of Salesforce to merge duplicates for an Account.

Answer: A,B