Which option lists only valid fixed-wing category identifiers?

Which option lists only valid fixed-wing category identifiers?

• A. A, B, C
• B. I, II, III
• C. S, L, H
• D. 1, 2, 3

Answer: (B)

In this practice framework, fixed-wing category identifiers are designated using Roman numerals. I, II, and III are the only numerals used to represent fixed-wing categories here, so a list that contains only those is valid. The other sets use letters or Arabic numerals that don’t conform to the fixed-wing category system used in this context, so they aren’t considered valid identifiers.

In this practice framework, fixed-wing category identifiers are designated using Roman numerals. I, II, and III are the only numerals used to represent fixed-wing categories here, so a list that contains only those is valid. The other sets use letters or Arabic numerals that don’t conform to the fixed-wing category system used in this context, so they aren’t considered valid identifiers.