Which of the following must be clearly stated on a supplementary license issued in Suffolk County?

The correct response highlights the importance of clarity regarding the nature of the supplementary license. A supplementary license is a specific type of license that indicates additional qualifications or permissions beyond a primary license. Labeling it explicitly as "Supplementary" on the license helps to avoid confusion among contractors, clients, and regulatory agencies about the nature and limitations of the license.

When a license clearly states that it is a supplementary one, it ensures that all parties understand that the holder has certain additional rights or capabilities that are not covered by a primary license. This helps maintain transparency in business operations and compliance with local regulations.

In contrast, the other options reflect different types of information that, while relevant, do not specifically pertain to the distinguishing feature of a supplementary license. They address aspects that might not be universally required on all supplementary licenses or may pertain to conditions that can vary significantly by case or need. Thus, having "Supplementary" clearly stated ensures that the license’s specific role and scope are immediately recognizable.