In which of the following scenarios must you perform a migration rather than an upgrade? Choose three.
A . Windows XP Professional (x64) to Windows 7 Professional (x64)
B . Windows Vista Business (x86) to Windows 7 Professional (x64)
C . Windows Vista Enterprise (x64) to Windows 7 Enterprise (x64)
D . Windows Vista Home Premium (x64) to Windows 7 Home Premium (x86)
Answer: A, B, D