You need to design access to e-mail by Internet users. What should you do?()
A.Configure front-end servers to use HTTP to communicate with back-end servers
B.Configure the internal firewall to allow IPSec traffic between front-end and back-end Exchange servers
C.Require all users to encrypt all outbound e-mail messages
D.Issue digital certificates to all remote users. Require the certificates to be used when authenticating to Outlook Web Access