Which two options can be used for vCenter Server 6.x database availability? (Choose two.)

A. Microsoft SQL Server 2012/2014 AlwaysOn Availability Groups (AG)

B. vCenter Server Watchdog

C. NSX load balancer

D. vCenter Server Heartbeat

E. Microsoft Windows Server Failover Clustering

Reference: https://kb.vmware.com/s/article/1024051