A nonprofit on Unlimited Edition uses direct mail extensively as a fundraising channel.

While Duplicate Rules and Matching Rules are essential for preventing new duplicates from being created, they do not help with a database that already contains existing duplicates (which is common after large direct mail imports).12

The Solution for "Auto13mating the Search":

On Unlimited Edition, Salesforce provides a feature called Duplicate Jobs.

Scanning the Database: Unlike rules that fire during a save, a Duplicate Job runs a scan across the entire existing database (or a specific segment) to find existing duplicate records based on your Matching Rules.

Reporting: Once the job completes, it generates a list of "Duplicate Record Sets." This allows the nonprofit's data integrity team to review and merge records in bulk.

Use Case: For a direct mail organization, running a Duplicate Job before a large mailing ensures they aren't wasting money by sending two identical letters to the same household.

Why other options are incorrect:

Duplicate/Matching Rules (Options A & C): These act as "gatekeepers" during data entry. They find duplicates only when a record is created or edited; they do not proactively "search" the existing database.

Scheduled Apex (Option D): This is a custom coding solution. A consultant should always recommend native, declarative features like Duplicate Jobs before suggesting custom code.