c) Network Operating System is the correct answer.
While there are various architectural models within distributed systems (like client-server, peer-to-peer, etc.), the overarching term for an operating system that manages a network of computers is a Network Operating System (NOS).
Incorrect options:
Zone-based Operating System: This term doesn't have a standard definition in the context of operating systems.
Level-based Operating System: This term also doesn't have a standard definition in the context of operating systems.
Therefore, Network Operating System is the most accurate and widely recognized term for an operating system that manages a distributed system.
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