Final answer:
None of the choices provided (R-22, R-134a, R-410A, Ammonia (R-717)) have a safety classification of B-1. Ammonia (R-717) is classified as B2, and the rest are classified as A1, indicating lower toxicity and flammability.
Step-by-step explanation:
The student is inquiring about the safety classification of various refrigerants. Safety classifications for refrigerants follow an A-B and 1-3 system, where 'A' or 'B' indicates the level of toxicity and '1', '2', or '3' represents the flammability level. Notably, R-717 (Ammonia) has a classification of B2, indicating that it has a higher toxicity (B) and a lower flammability (2).
Given the options of R-22, R-134a, R-410A, and R-717 (Ammonia), none of these are classified as B-1; however, hydrochlorofluorocarbon-22 (HCFC-22), R-134a, and R-410A are all classified as A1, which means they are lower in toxicity and flammability. The B-1 classification typically signifies low flammability and higher toxicity but does not apply to any of the choices presented.