Encrypting File System (EFS) can be used with Windows XP Professional when

Encrypting File System (EFS) can be used with Windows XP Professional when:

A.
upgrading from Windows 98 to Windows XP Home.

B.
configuring a computer that contains both Windows 2000 and XP Professional.

C.
using only NTFS file system.

D.
upgrading from Windows 2000 to Windows XP Professional.