Which statement correctly distinguishes a network service from a protocol?

In computer networking, a service and a protocol are related but distinct concepts. A network service is defined as an interface that allows one layer to request functionality from the layer below it. It represents what is offered, not how it is achieved. Conversely, a protocol consists of the specific rules and conventions that govern communication between peer entities at the same layer. It is the implementation mechanism used to realize a service.\nOption B correctly captures this relationship by stating that a service is an interface while a protocol provides the rules to implement it. Option A incorrectly reverses their operational scope; protocols operate between peers, whereas services are vertical interfaces within the stack. Option C confuses their roles by suggesting protocols decide service offerings, which is incorrect as services define the capabilities available to upper layers. Option D is inaccurate because both concepts can be viewed abstractly or concretely depending on context, but the fundamental distinction lies in interface versus implementation rules.