You have a computer named Computer1 that runs Windows XP Professional. Computer1 is a member of a workgroup. You need to prevent all users from encrypting files on Computer1. What should you do?（）

A. For all files, deny the Take ownership permission to the Everyone group.
B. From the Local Security Policy, modify the Encrypting File System (EFS) properties.
C. From the Certificates snap-in, delete the recovery agent certificate.
D. From the Certificates snap-in, delete all trusted root certification authority (CA) certificates.&e