A.Provides stateful session failover for sessions.
B.Increases security capabilities for IPsec sessions.
C.Provides active-passive control and data plane redundancy.
D.Enables automated fast-reroute capabilities.
E.Synchronizes configuration files and session state

A.You cannot assign st interfaces to a security zone.
B.You cannot apply static NAT on an st interface logical unit.
C.st interfaces are optional when configuring a route-based VPN
D.A static route can reference the st interface logical unit as the next-hop