Final answer:
Paperless billing is enabled at the system level of the facility structure, allowing for electronic handling of billing processes and documents.
Step-by-step explanation:
Paperless billing is enabled at the system level of the facility structure. This means that it is enabled for the entire facility, rather than at a specific level within the structure.
When paperless billing is enabled, all billing processes and documents are handled electronically, eliminating the need for printed bills and statements. This can help to reduce costs, improve efficiency, and minimize the environmental impact of paper waste.