Unicast Reverse Path Forwarding can perform all of these actions except which one？（）

• A、examine all packets received to make sure that the source addresses and source interfaces appear in the routing table and match the interfaces where the packets were received
• B、check to see if any packet received at a router interface arrives on the best return path
• C、combine with a configured ACL
• D、log its events，if you specify the logging options for the ACL entries used by the unicast rpf command
• E、inspect IP packets encapsulated in tunnels， such as GRE