Exam Certified Advanced Administrator topic 1 question 33 discussion

Validation rules are a function that returns errors from true/false values, so you cannot enter values ​​into items.

Both A&C are correct. However In terms of best practice, workflow will take precedence over Apex. My vote is for A and C

B & C are the right answers. But, since we are now in 2023, I believe Flow would be the right answer. Also, check out this video on using VLOOKUP in validation rules: https://www.youtube.com/watch?v=s6qxZ96MZKQ

B. Use a validation rule to do a VLOOKUP of the Billing Postal Code to a custom object that maps postal codes to states/provinces. C. Use a workflow that populates Billing State/Province based on a custom object that maps postal codes to states/provinces. The following are the explanations for the above two options: B. Use a validation rule to do a VLOOKUP of the Billing Postal Code to a custom object that maps postal codes to states/provinces. This solution will work by creating a custom object that maps the postal codes to their respective state/province. The validation rule will then reference this custom object to populate the Billing State/Province field based on the Billing Postal Code. C. Use a workflow that populates Billing State/Province based on a custom object that maps postal codes to states/provinces. This solution works similarly to the validation rule approach, but uses a workflow to automate the process.

A flow would indeed be better (as a reminder workflow will be deactivated Winter '23) https://provenworks.com/populate-us-state-from-zip-code-using-a-salesforce-flow/

Why trigger and not workflow? I think answers are A and C