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?

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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?
A . upsert orders;
B . upsert orders Order_Number__c;
C . merge orders Order_Number__c;
D . merge orders;

Answer: B