Which two statements are true about Highly Available vSphere Auto Deploy infrastructure?

Which two statements are true about Highly Available vSphere Auto Deploy infrastructure? (Choose two.)
A. It helps prevent data loss.
B. It is a prerequisite for using vSphere Auto Deploy with stateful install.
C. It requires two or more Auto Deploy servers.
D. It is a prerequisite for using vSphere Auto Deploy with stateless caching.