You deploy a mobile messaging solution with Microsoft Exchange Server 2003 Service Pack 2.   The company security policy requires complex passwords on all the Microsoft Windows Mobilebased devices.   You provide a Microsoft Windows Mobile 5.0 smartphonebased device to a new user. The first time the user uses the device， the user is not prompted for a password. You need to ensure that the user is prompted for a password.   What should you do？（）

• A、Instruct the user to set a PIN on the mobile device.
• B、Instruct the user to perform Microsoft Exchange ActiveSync synchronization Over-The-Air （OTA）.
• C、On the Device Security Settings tab， select the Require both numbers and letters option.
• D、Add the user account of the user to the Exceptions list on the Device Security Settings tab.