A migration cutover plan has validated the target database but not application data reconciliation. Which two checks are most important before declaring success? Select 2 answers.

1. Keep both databases independently writable indefinitely without conflict handling.
2. Use target row count alone as proof that every value and business rule matches.
3. Validate end-to-end business operations and the final write-authority transition.
4. Validate transferred data and investigate any reported mismatches or unsupported validation scope.
5. Delete the source before any target business operation is tested.