Refer to the exhibit. Which three Cisco IOS features can be used on the VPN gateways (Cisco
IOS routers) to implement high availability for remote-access IPsec VPN? (Choose three.)

A.
Dynamic VTIs

B.
Reverse Route Injection (RRI)

C.
VPN clustering

D.
Dead Peer Detection (DPD)

E.
cooperative key servers

F.
virtual contexts