How does the FortiGate handle web proxy traffic coming from the IP address 10.2.1.200 that requires authorization?

Examine this FortiGate configuration:

How does the FortiGate handle web proxy traffic coming from the IP address 10.2.1.200 that requires authorization?
A . It always authorizes the traffic without requiring authentication.
B. It drops the traffic.
C. It authenticates the traffic using the authentication scheme SCHEME2.
D. It authenticates the traffic using the authentication scheme SCHEME1.

Answer: D

Explanation:

"What happens to traffic that requires authorization, but does not match any authentication rule? The active and passive SSO schemes to use for those cases is defined under config authentication setting"