A company uses Salesforce to store accounts and contacts.

A company uses Salesforce to store accounts and contacts. All users have switched to the Lightning Experience user interface. The Account Hierarchy feature is used extensively to relate companies to their subsidiaries. A Solution Architect finds that the data migration process is creating duplicate contacts with different primary accounts.

Which two options can the Solution Architect use to ensure that there is only a single contact for a particular person across all the subsidiaries of a company?