Refer to the exhibit.

The correct answer is C. FortiGate routes the traffic flow according to the FIB. The exhibit shows a regular policy route configured with source 10.0.1.128/255.255.255.128 and destination 128.66.0.0/255.255.255.0. The test source 10.0.1.130 belongs to the 10.0.1.128/25 subnet, and destination 128.66.0.125 belongs to 128.66.0.0/24; therefore, the traffic matches this policy route.

Crucially, the route contains set action deny. For a router policy, this does not mean that FortiGate discards the packet as a firewall DENY would. It represents Stop Policy Routing. Fortinet explains that when a packet matches this action, FortiGate stops policy-route processing and routes the packet using the forwarding information base (FIB).

Regular policy routes also have precedence over SD-WAN rules. Consequently, even though SD-WAN service 4 shown in the exhibit matches source 10.0.1.0-10.0.1.255 and destination 128.66.0.0-128.66.255.255, its round-robin selection of port1 and port2 does not control this flow. The matching regular policy route terminates policy routing first.

Study Guide Reference: SD-WAN Configuration and Monitoring > Policy Routes > Route Lookup and FIB Processing, pages 423–424.