What should an Architect recommend to ensure the data in Salesforce is identical to the MDM?

Universal Containers (UC) is concerned about the accuracy of their Customer informationin Salesforce. They have recently created an enterprise-wide trusted source MDM for Customer data which they have certified to be accurate. UC has over 20 million unique customer records in the trusted source and Salesforce.

What should an Architect recommend to ensure the data in Salesforce is identical to the MDM?
A . Extract the Salesforce data into Excel and manually compare this against the trusted source.
B. Load the Trusted Source data into Salesforce and run an Apex Batch job to find difference.
C. Use an AppExchange package for Data Quality to match Salesforce data against the Trusted source.
D. Leave the data in Salesforce alone and assume that it will auto-correct itself over time.

Answer: C