How do I differentiate the questions: (a) what specific refrigerant do you use in your facility, and (b) what types of refrigerants do you use in your facility?

The differentiation is akin to chemical name vs chemical classification. Type options will give you a range of classifications or types of refrigerants, where the second question gets into specific names of refrigerants within each class to ensure facilities can easily select the proper refrigerant without going through an extended list.