Which design decision should the architect make to maximize availability for backups?

An architect is designing an environment for a retail customer. The design will use a single small vCenter Server Appliance and a cluster of eight ESXi hosts at a remote site. There is a single 10 GbE connected network at the remote site to support all management services. It is not possible to create additional management networks at the remote site. Virtual machine backups at the site will be dependent on the vCenter Server being available.

Which design decision should the architect make to maximize availability for backups?
A . vCenter Server High Availability will be configured.
B . The vCenter Server Appliance will be protected with vSphere Fault Tolerance.
C . The cluster will be configured to use vSphere DRS in fully automated mode.
D . The cluster will be configured with vSphere HA and set to restart virtual machines based on guest operating system heartbeat monitoring.

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Answer: D