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

B.
upgrading from Windows 2000 to Windows XP Professional.

C.
upgrading from Windows 98 to Windows XP Home.

D.
using only NTFS file system.