You deploy mobile devices that run Microsoft Windows Mobile 5.0.   Company security policy requires an authentication process that is stronger than a user name and password combination.   You need to ensure that Microsoft ActiveSync sessions use an authentication process that meets the company security policy.   What should you do？（）

• A、Deploy a two-factor authentication process.
• B、Deploy a single-factor authentication process.
• C、Deploy a simple PIN policy for the Windows Mobilebased devices.
• D、Deploy a complex PIN policy for the Windows Mobilebased devices.