C.No, it is not required but is strongly recommended as it reduces the scope and cost of PCI DSS compliance
D.It is required only for service providers
Why C is correct
PCI DSS does not mandate network segmentation, but it is strongly recommended. Without segmentation, the entire network is in scope for PCI DSS, significantly increasing compliance burden and cost.
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Where this fits in the PCI DSS exam
Scoping Segmentation
Covers scoping segmentation concepts and practices within PCI DSS.
This question belongs to the "Build & Maintain a Secure Network" domain, which makes up about 20% of the PCI DSS exam.
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When does a third-party service provider's environment become part of the organization's PCI DSS scope?