Which function does the HA4 interface provide when implementing a firewall cluster which contains firewalls...

Perform packet forwarding to the active-passive peer during session setup and asymmetric traffic flow.

Perform synchronization of routes, IPSec security associations, and User-ID information.

Perform session cache synchronization for all HA cluster members with the same cluster ID.

Perform synchronization of sessions, forwarding tables, and IPSec security associations between firewalls in an HA pair.