Which two virtual machines can be configured to use VMware Fault Tolerance?

An organization has a number of virtual machines that would benefit from Fault Tolerance.

These include:

A single vCPU Apache Server

A dual vCPU vCenter Server

A quad vCPU SQL Server

An eight vCPU Hadoop Server

Which two virtual machines can be configured to use VMware Fault Tolerance? (Choose two.)
A . Apache Server
B . vCenter Server
C . SQL Server
D . Hadoop Server