Refer to the exhibit.

The study guide explicitly explains the FortiGuard flags shown by diagnose debug rating:

D = Default

“IP addresses of servers received from DNS resolution”

It then clarifies even more specifically:

“D = The IP address FortiGate got when resolving the service.fortiguard.net name (usually two or three servers have this flag, if the administrator didn ' t overwrite the FortiGuard FQDN or IP address in the FortiGate configuration)”

In the exhibit, among the answer choices, the IP address marked with the D flag is 208.91.112.194 . Therefore, that is the IP FortiGate got from resolving service.fortiguard.net.

Why the other options are wrong:

B. 209.22.147.36 is not the correct choice because in the exhibit it is not the DNS-resolution entry identified by the D flag

C. 64.26.151.37 has no D flag

D. 96.45.33.65 has no D flag

So the verified answer is: A .