A SSN__c custom field exists on the Candidate__c custom object. The field is used to store each candidate's social security number and is marked as Unique in the schema definition. As part of a data enrichment process, Universal Containers has a CSV file that contains updated data for all candidates in the system. The file contains each Candidate's social security number as a data point. Universal Containers wants to upload this information into Salesforce, while ensuring all data rows are correctly mapped to a candidate in the system. Which technique should the developer implement to streamline the data upload?
Select one answer.
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