vCenter High Availability (HA) protects vCenter Server against host and hardware failures. What is the minimum number of ESXi hosts required to enable this capability? (Choose the best answer.) 

Answer options:

A. 5
B. 7
C. 1
D. 3

D

Reference: https://docs.vmware.com/en/VMware-vSphere/7.0/vsphere-esxi-vcenter-server-70-availability-guide.pdf (73)