https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000ClGJCA0

Device Group Hierarchy
* Shared
* DATACENTER_DG
* DC_FW_DG
* REGIONAL_DG
* OFFICE_FW_DG
* FW-1_DG
Analysis
Considerations:
* FW-1 is assigned to the FW-1_DG device group.
* FW-2 is assigned to the OFFICE_FW_DG device group.
* There are no objects configured in REGIONAL_DG and OFFICE_FW_DG device groups.
The address object Server-1 appears in multiple device groups with different IP addresses. The device groups have a hierarchy, which means objects can be inherited from parent groups unless overridden in the child group.
* FW-1_DG:
* Server-1 has IP 4.4.4.4, which will be pushed to FW-1 because it is in the FW-1_DG device group.
* OFFICE_FW_DG (for FW-2):
* Since there are no objects in OFFICE_FW_DG and REGIONAL_DG, FW-2 will inherit from Shared.
* In the Shared group, Server-1 has IP 1.1.1.1.

When configuring Quality of Service (QoS) policies, particularly for traffic going to or from specific IP addresses and involving NAT, it's important to base the rule on how the firewall processes the traffic. For QoS, the firewall evaluates traffic using pre-NAT IP addresses and zones because QoS policies typically need to be applied before the NAT action occurs. This is especially true for inbound traffic, where the goal is to limit bandwidth before the destination IP is translated.
The correct combination for a QoS rule in this scenario, where the aim is to limit bandwidth for downloads from a specific server (implying inbound traffic to the server), would be:
D: Pre-NAT source IP address Pre-NAT source zone:
* Pre-NAT source IP address: This refers to the original IP address of the client or source device before any NAT rules are applied. Since QoS policies are evaluated before NAT, using the pre-NAT IP address ensures that the policy applies to the correct traffic.
* Pre-NAT source zone: This is the zone associated with the source interface before NAT takes place.
Using the pre-NAT zone ensures that the QoS policy is applied to traffic as it enters the firewall, before any translations or routing decisions are made.
By configuring the QoS rule with pre-NAT information, the firewall can accurately apply bandwidth limitations to the intended traffic, ensuring efficient use of network resources and mitigating the impact of large file downloads from the specified server.
For detailed guidelines on configuring QoS policies, refer to the Palo Alto Networks documentation, which provides comprehensive instructions and best practices for managing bandwidth and traffic priorities on the network.