You are a network engineer of your company. Study the following exhibit carefully, which three
Cisco IOS features could 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.
cooperative key servers

D.
Dead Peer Detection (DPD)