A company has a custom object, Order__c, that has a required, unique, external ID field called Order_Number__c.
Which statement should be used to perform the DML necessary to insert new records and update existing records in a List of Order__c records?
Select an option, then click Submit answer.
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upsert orders;
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upsert orders Order_Number__c;
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merge orders Order_Number__c;
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merge orders;