You have an Exchange 2010 organization. Your companys security policy states that all connections to Outlook Web App （OWA） must use smartcard authentication. You need to recommend a solution to meet the security policy requirements. Which two possible ways to achieve this goal should you recommend？（）

A. Require certificate-based authentication for all Internet-facing Client Access servers.
B. Require Windows Integrated Authentication for all Internet-facing Client Access servers.
C. Deploy an Edge Transport server， and then disable Windows Integrated Authentication.
Deploy a server that runs Microsoft Internet Security and Acceleration （ISA） Server， and then enable Kerberos constrained delegation.