Which of the following operating systems can be upgraded directly to Windows 7 Professional by a default installation?

Which of the following operating systems can be upgraded directly to Windows 7 Professional by a
default installation? (Select TWO).

A.
Windows 7 Home Premium

B.
Windows Vista Business

C.
Windows XP Home

D.
Windows XP Professional 64-bit

E.
Windows XP Media Center

Explanation:
http://technet.microsoft.com/en-us/library/dd772579(v=ws.10).aspx