No person or company shall advertise without a ____ license.

• A. apprentice
• B. journeyman
• C. master
• D. contractor

Answer: (C)

Advertising plumbing services requires holding the master license because this credential shows you’ve reached the highest level of qualification and are legally authorized to perform and supervise all plumbing work. The master plumber license proves you meet the required experience, training, and testing, and it assigns responsibility for ensuring code compliance and safety. Public marketing of plumbing services is restricted to those with this authority to protect the public and ensure accountability. An apprentice isn’t licensed to practice independently, and a journeyman can perform work under supervision but isn’t typically allowed to advertise services as a licensed plumber. A contractor license may relate to running a business, but the specific authorization to advertise plumbing work hinges on having the master license.