What does a selective router specify according to the King County ruling?

A selective router is critical in the context of emergency response systems as it plays a specific role in the distribution of emergency calls to the appropriate Public Safety Answering Point (PSAP). According to the King County ruling, the selective router is responsible for establishing the cost responsibility demarcation point. This indicates where the financial obligations for the network begin and end, particularly concerning the infrastructure and services necessary for handling emergency calls.

This demarcation point is essential for clarifying financial responsibilities among various entities involved in the emergency call network, such as telecommunications providers and local government agencies. Understanding this concept helps ensure that emergency services are adequately funded and maintained, leading to more efficient response times and better overall service.

The other options, while relevant to the broader context of emergency management, do not accurately describe the specific role of the selective router as determined by this ruling. This clarity in responsibility is crucial for the operational efficacy of emergency response systems.