Which characteristic most clearly distinguishes a data lakehouse from a traditional data warehouse?

A data lakehouse unites the low-cost scalable storage of a data lake with the ACID transactions and governance features of a data warehouse; traditional warehouses store data in proprietary columnar formats on dedicated storage. The incorrect options ("A data lakehouse stores only structured relational data in proprietary formats", "A data lakehouse requires ETL pipelines to move data before queries can run", "A data lakehouse cannot support BI tools or SQL analytics") are distractors that don't fully capture the concept described.