Universal Containers uses Salesforce to track orders in an Order__c object. The Order__c object has private organization-wide defaults. The Order__c object has a custom field, Quality_Controller__c…

Universal Containers uses Salesforce to track orders in an Order__c object. The Order__c object has private organization-wide defaults. The Order__c object has a custom field, Quality_Controller__c, that is a Lookup to User and is used to indicate that the specified User is performing quality control on the Order__c. What should be used to automatically give read only access to the User set in the Quality_Controller__c field?