You are creating a Windows Forms Application by using the .NET Framework 3.5.Your applciation will be used by a government depertment.You need to ensure that the application meets "accessibilty" requirements.Which three actions should you perform？（）

• A、Expose keyboard focus visually and programmatically.
• B、Use the NeutralResourceLanguageAttribute attribute in the assembly.
• C、Provide documented keyboard access to all application features.
• D、Set all the colors to primary colors when the high contrast mode is on.
• E、Display all user interface elements by using the system color scheme when high contrast mode is off.
• F、Either display all visual cues or create sound effects for any information.