What is required to implement Auto Image Replication?

A.
BasicDisk or AdvancedDisk storage units and at least one Master Server
B.
OST-compliant appliances or MSDP and at least one Master Server
C.
OST-compliant appliances or MSDP and at least two Master Servers
D.
BasicDisk or AdvancedDisk storage units and at least two Master Servers