Policy -Based Routing (PBR) has been enabled on Router R1's interfa ce F0/0. Which of the following is true regarding how PBR works?（）

• A、Packets entering F0/0 will be compared based on the PBR route map.
• B、Packets exiting F0/0 will be compared based on the PBR route map.
• C、IOS ignores the PBR forwarding directions wh en the packet matches a route map deny clause.
• D、IOS ignores the PBR forwarding directions when the packet matches a route map permit clause.