Northern Trail Outfitters (NTO) has been using Salesforce for Sales and Service for 10 years. For the past two years, th

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Northern Trail Outfitters (NTO) has been using Salesforce for Sales and Service for 10 years. For the past two years, the marketing group has noticed a rise from 0% to 35% in returned mail when sending mail using the contact information stored in Salesforce.
Which solution should the data architect use to reduce the amount of returned mail?

A. Email all customers and ask them to verify their information and to call NTO if their address is incorrect.
B. Delete contacts when the mail is returned to save postal costs for NTO.
C. Have the sales team call all existing customers and ask to verify the contact details.
D. Use a third-party data source to update the contact information in Salesforce.