You are a messaging professional. Your company uses a Microsoft Exchange Server 2007 messaging system.

The company has 13,500 employees distributed across its main office and 12 branch offices. Mailbox servers, Client Access Servers, and Hub Transport servers are deployed in each office.

The sales department personnel often send e-mail messages that contain the corporate account numbers of customers. These corporate account numbers are confidential.

You need to prevent the personnel from sending e-mail messages that contain confidential corporate information through the Internet.

What should you do to prevent the personnel from sending e-mail messages that contain confidential corporate information through the Internet?

A.
Create a Journal rule on a Hub Transport server. Configure the rule to journal all messages sent by the sales team personnel.

B.
Create a Transport rule for the Hub Transport server role. Configure the rule to drop messages that contain the client account numbers.

C.
Create a Transport rule on a Hub Transport server. Configure the rule to assign a Confidential message classification to all messages that contain the client account number and to copy the message to an alternate mailbox.

D.
Deploy certificates that can be used to encrypt messages by using S/MIME to all client computers that are used by the sales team personnel. Instruct the sales team personnel to encrypt all messages that contain confidential information by using S/MIME.