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Salesforce Certified Platform App Builder · Salesforce
Select one answer.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
First I thought of A but since Formula fields can change over time then it should be D. You can set the workflow rule so you cannot change the fields later.
If use Formula Field, the value can be change if the associated account has been changed.But if you use a WF that with criteria 'created record' and read only field that value will be not be change at all time.
The reason why A is incorrect: IF(ISNEW(), Account.BillingState , PRIORVALUE(Account.BillingState)) this would be true only if formula field supported ISNEW and PRIORVALUE functions. Correct answer is D. Workflow rule can be created on opportunity that will fire only when record is created.