Which two statements regarding a Machine Catalog are valid? (Choose two.)
A. A Machine Catalog can span hypervisor hosts.
B. A Machine Catalog created with Machine Creation Services (MCS) can have multiple master images.
C. A single Machine Catalog can contain both Server and Desktop OS machines.
D. A Machine Catalog can span XenApp/XenDesktop Sites.
E. A Machine Catalog can be rolled back to a previous master image.