Which statement describes network as a service (NaaS)?

Network as a Service is a cloud service model in which networking capabilities are delivered on demand rather than owned and operated entirely through fixed physical infrastructure. NaaS can include virtual routing, secure connectivity, bandwidth services, policy enforcement, remote access, and other network functions consumed as a service. The key concept is elasticity: the customer uses network resources when needed while the provider operates much of the underlying service delivery platform. Answer B describes a monitoring application, not a service model. Answer C describes a traditional enterprise-owned network model, which is the opposite of NaaS. Answer D describes protocol standardization, not cloud-delivered networking. NaaS reflects the broader cloud pattern of abstracting infrastructure into consumable services. In security architecture, NaaS can support distributed users, cloud workloads, and branch connectivity without requiring all enforcement to sit in a single physical data center. Reference/topics: Cloud Security 5.2, cloud service models including NaaS; Network Fundamentals 2.1, SD-WAN and area networks.