In Zscaler's PAC file guidance for directing traffic to specific Subclouds, the fully qualified proxy host name is constructed using the standard gateway label, followed by the subcloud identifier, and then the Zscaler cloud domain. In template form, this is represented as:

{GATEWAY.<Subcloud>.<Zscaler cloud>}

Here, GATEWAY corresponds to the Zscaler gateway label, <Subcloud> is the dynamically assigned subcloud (which helps optimize routing and resiliency), and <Zscaler cloud> represents the customer's Zscaler cloud domain (for example, one of the standard ZIA cloud domains). The Digital Transformation Engineer training emphasizes that using the correct order of these variables ensures that browsers resolve to the appropriate subcloud-specific gateway, enabling optimized performance and regional affinity.

Options B and C incorrectly introduce or misplace a REGION label, which does not match the documented variable order when explicitly targeting a Subcloud. Option D reverses the positions of GATEWAY and <Subcloud>, which does not align with the hostname structure used by Zscaler for subcloud-aware PAC configurations.

Therefore, the correct PAC variable pattern for forwarding web traffic specifically to a Subcloud is {GATEWAY.<Subcloud>.<Zscaler cloud>}.