TREC promulgated contract forms must be used by:

Only brokers is incorrect because the requirement applies to all licensees, not just brokers. While brokers may have additional responsibilities, both brokers and agents must use TREC promulgated forms when applicable.

Only new agents is incorrect because the requirement applies to all licensees, regardless of their experience level. Both new and seasoned licensees must use TREC promulgated forms when applicable.

Only for commercial transactions is incorrect because TREC promulgated forms must be used for both residential and commercial transactions where applicable. The requirement is transaction-type neutral.