What is the purpose of the discard action of a firewall filter?

Which two statements describe PFE functions are true?

In your configuration, an interface contains multiple IP addresses belonging to the same subnet. You want to identify the IP address to use for packets sent to hosts on the same subnet.
Which parameter would you use to accomplish this task?

Click the Exhibit button.

Referring to the exhibit, which two statements are correct? (Choose two.)

What are two modes of unicast reverse path forwarding? (Choose two.)