Final answer:
The sizes mentioned refer to physical measurements for uniform badges and the correct answer is obtained from military uniform regulation sources.
Step-by-step explanation:
The service stars on the male Navy Service Uniform (NSU) are measurement badges used to represent a certain period of time a member has served. Based on the description provided, the student is likely referring to a factual measurement rather than a conceptual understanding of measuring stellar diameters, which would be a topic in astronomy. Therefore, the sizes provided (e.g., 2 inches by 3 inches, 4 inches by 6 inches, etc.) are examples of specific, physical measurements, not concepts from astronomy. The correct answer should be obtained from the appropriate military uniform regulation source, not the Sky & Telescope article, and cannot be determined from the provided information since it purely requires referencing the correct standard issue guideline.