Which of the following is a valid CT rating?

• A. CTV
• B. ECT
• C. RB1
• D. RB6

Answer: (A)

In this area, CT ratings are compact, three-letter codes that denote a specific classification within a standard system. CTV matches the common three-letter rating pattern used for CT codes, so it’s the valid CT rating. The other options don’t fit the established CT-rating abbreviations: ECT uses a prefix that isn’t typically used for CT ratings, and RB1 and RB6 mix letters with numerals in a way that isn’t part of the standard CT rating naming. So CTV is the correct choice. If you’re unsure, check the domain’s glossary or standards to see how CT ratings are defined in that context.