A PySpark input has several versions per AccountID. The latest UpdatedAt wins, with Sequence as a deterministic tie-breaker. Which design elements are needed? Select 2 answers.

1. Use dropDuplicates on AccountID without ordering
2. Partition a ranking window by AccountID
3. Apply limit(1) to the whole input
4. Order by UpdatedAt DESC and Sequence DESC, then retain row_number 1