Containing a security incident to an individual zone is the correct answer.

Network zoning isolates customer facing systems from back end systems so that a compromise in one zone does not automatically affect other zones. This containment reduces the blast radius and limits an attackers lateral movement which makes detection and remediation easier and faster.

Segmentation is enforced with network controls such as firewalls, security groups, access control lists, and microsegmentation in cloud environments. These controls let operators apply stricter rules and monitoring on sensitive zones which supports incident containment and recovery.

Improving overall network throughput is incorrect because zoning is a security measure and it does not inherently increase throughput. In some cases segmentation can add inspection points that affect performance rather than improve it.

VPC Service Controls is incorrect because that is a specific cloud vendor feature and not the general primary benefit of network zoning. The question asks about the fundamental security advantage which is containment and not a particular product.

Lowering administrative expenses for network upkeep is incorrect because segmentation often increases configuration and policy management work. The primary goal is improved security and not reduced administrative cost.

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