What was the duration for the 'good-until-revoked' licenses issued until?

The correct answer is December 31, 1935, which signifies the last date that 'good-until-revoked' licenses were issued in Utah. This terminology refers to licenses that remained valid until the issuing authority decided to revoke them, rather than having a fixed expiration date. The historical context highlights a significant change in how driver licenses were managed, showcasing a shift toward more standardized practices for validity and expiration.

Selecting December 31, 1935, underscores the end of an era when licenses did not require periodic renewal unless actively revoked. Understanding this detail helps in grasping the evolution of licensing practices which have since moved towards regular renewals and stricter controls on driver qualifications.