Study the exhibit carefully. The Cisco IOS IPsec High Availability （IPsec HA） Enhancementsfeature provides an infrastructure for reliable and secure networks to provide transparent availability of the VPN gateways - that is， Cisco IOS Software-based routers. What are the twooptions that are used to provide High Availability IPsec？（）

• A、HSRP
• B、Dual Router Mode （DRM） IPsec
• C、IPsec Backup Peerings
• D、RRI