问题：

[单选] 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