Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_6 (driver VARCHAR, rounds VARCHAR, entrant VARCHAR)
### Question:
Which driver was in all rounds as an entrant of Motor Racing Developments?
### Answer:
SELECT driver FROM table_name_6 WHERE rounds = "all" AND entrant = "motor racing developments"