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Universal Container wants Opportunities to no longer be editable when reaching the Clousd stage. How should a develoiper accomplish this?
Correct Answer: D
A validation rule is a formula that evaluates the data in one or more fields and returns a value of true or false. Validation rules verify that the data a user enters in a record meets the standards you specify before the user can save the record. A validation rule can contain a formula or expression that evaluates the data in one or more fields and returns a value of true or false. Validation rules also include an error message to display to the user when the rule returns a value of false after the user attempts to save the record. In this case, a validation rule can be used to prevent users from editing opportunities that have reached the Closed stage by checking the value of the StageName field and displaying an error message if the user tries to save any changes. References: Validation Rules Salesforce Platform Developer 1 Exam Guide, page 6.