Designed to serve a geographic area where the subscribers are within the defined loop length of the central office.

• A. Alternate routing
• B. Selective router
• C. Host/Remote
• D. Stand-alone switch

Answer: (D)

The idea being tested is how a central office is matched to the geographic reach of its local subscribers based on loop length. A stand-alone switch is designed to serve a geographic area where all subscribers fall within the defined loop length of the central office, meaning the local copper loops connect directly to that CO without needing remote cabinets. This setup keeps the service area compact and centralized.

The other options serve different purposes: a host/remote arrangement uses remote cabinets connected to a host switch to extend reach beyond the local loop; a selective router handles routing of 9-1-1 calls to appropriate PSAPs; and alternate routing provides backup paths for call routing.