A downstream store receives replayed CDC events and can receive older events after a newer change for the same source row. It must preserve the latest source state and handle source deletes. Which processing behaviors are required? Select 2 answers.

1. Use a stable source-row identity and preserve the operation type, including deletes.
2. Compare a reliable source change position or version and apply changes idempotently so stale or repeated events do not replace newer state.
3. Convert all delete events into insert events with a fresh random key.
4. Append every replayed event to the current-state table with no row identity or deduplication.
5. Use arrival time alone as proof that the last received event is the newest source change.