You need to design a solution so that users in the retail outlets can access their e-mail on the Exchange 2003 servers. What should you do？（）

A. Install an Exchange 2003 server infrastructure that will support POP3 connections from the Internet. Install a user certificate on each client computer at the retail outlets. Instruct the users to sign and encrypt all outbound e-mail messages
B. Install an Exchange 2003 server infrastructure that will support encrypted POP3 connections from the Internet. Configure the client computer in the retail outlets to use an encrypted connection to the POP3 server
C. Install an Exchange 2003 server infrastructure that will support encrypted Microsoft Outlook Web Access connections from the Internet. Instruct all users at the retail outlets to access their e-mail by using Microsoft Internet Explorer 5.5 or later to connect to the secure Microsoft Outlook Web Access server
D. Install an Exchange 2003 server infrastructure that will support encrypted IMAP4 connections from the Internet. Configure the client computers in the retail outlets to use an encrypted connection to the IMAP4 server