The Zscaler Zero Trust Exchange has:

The correct answer is C . Zscaler’s reference architectures consistently describe the Zero Trust Exchange as a globally distributed inline cloud platform operating across more than 150 data centers worldwide . The Traffic Forwarding in ZIA reference architecture states that Zscaler has deployed ZIA Service Edge devices in 150+ data centers around the world , allowing users to connect to the nearest service edge for policy enforcement, TLS/SSL inspection, firewalling, and other security services. This design removes the need for centralized backhauling and supports consistent security regardless of user location.

The option mentioning “limited core sites” is incorrect because the Zscaler model is specifically designed to avoid relying on a small number of centralized inspection points. The option about “few high-traffic regions” is also incorrect for the same reason. In addition, Zscaler architecture supports private service edge deployment models for organizations that require local processing in private environments, extending the Zero Trust Exchange model beyond public cloud service edges. Therefore, the only accurate architecture-aligned answer is that Zscaler provides scalable inspection at 150+ public locations and in private locations where needed .