[单选题]44、 Which of the following can provide for stateful HA between ASA devices during a failover?故障切换时，下面哪种方法可以在ASA设备之间提供基于状态的HA?
A. VPN load balancing VPN负载平衡
B. Active/standby failover active/standby故障切换
C. External load balancer 外部负载平衡器
D. AnyConnect redundant peering AnyConnect冗余对等体