✅ A. Create a validation rule to check that necessary information is complete upon Lead conversion
✔ Ensures that key fields like phone, email, or background info are filled before a Lead can be converted.

✅ C. Review Lead conversion mapping to ensure necessary fields are mapped correctly
✔ Prevents data loss during conversion by ensuring important Lead fields are properly mapped to Contact, Account, and Opportunity fields.

✅ E. Update web-to-lead forms to require input fields be completed prior to submission
✔ Ensures that Leads coming in from external sources (like websites) are not incomplete.

Answer: ACE

Validation rules are more suitable for validating field format.