You are a desktop support technician for Contoso, Ltd. All client computers run Windows XP Professional and Microsoft Outlook 2002.

The company’s new written security policy requires that all e-mail messages sent to the financial auditor must be encrypted. An administrator issues a digital certificate for encrypting e-mail messages. Each user sends the user’s digital certificate to the auditor by using an e-mail message.

A user reports that when he attempted to send an encrypted e-mail message to the auditor, he received the following error message.
You discover that all users are experiencing the same problem.

You need to ensure that users can encrypt e-mail messages sent to the auditor.

What should you do?

A.
Ask an administrator to configure all client computers to use IPSec.

B.
Ask an administrator to configure a data recovery agent in Encrypting File System (EFS).

C.
Instruct the auditor to send her digital certificate to all users by using an e-mail message.

D.
Instruct each user to use Encrypting File System (EFS) to encrypt the user’s digital certificate. Then instruct each user to resend the digital certificate to the auditor by using an e-mail message.