All of the following lines of authority are considered limited lines EXCEPT:

The correct answer focuses on the classification of various lines of insurance and their distinction between limited and broader lines. Accident and health insurance encompasses a wide range of coverage related to medical expenses, disability benefits, and other health-related risks, making it a comprehensive form of insurance. This broad scope means that it does not fit within the defined category of limited lines of authority, which typically pertain to specialized types of insurance with specific limitations on coverage.

In contrast, guaranteed automobile protection, credit disability insurance, and pet insurance are all considered limited lines because they focus on particular types of coverage: guaranteed automobile protection pertains only to vehicle-related losses, credit disability insurance covers a specific circumstance related to loan payments, and pet insurance is specifically designed for health-related issues pertaining to pets. These limited lines have reduced scope and do not provide the same breadth of coverage that accident and health insurance does, highlighting the reason why accident and health insurance stands apart in this context.