Final answer:
The correct entry for creating a cabin pet PNR depends on the airline or GDS system in use, and it is recommended to consult the specific resources of the airline or system for the accurate code used to indicate a passenger traveling with a cabin pet.
Step-by-step explanation:
The entry used to create a cabin pet Passenger Name Record (PNR) in the travel industry, particularly for airlines, is generally designated with a specific code that travel agents should use when making a reservation for a passenger traveling with a pet. The correct entry for this purpose can vary depending on the airline's reservation system or the Global Distribution System (GDS) being used.
While the provided options are B. PETCAB, A. CPET, C. PNRPET, D. CABPET, without a specific GDS or airline context, it is not possible to determine the universally correct entry. It is recommended to consult the specific airline's policy or the GDS help resources for the accurate code.