You install Microsoft Windows Vista on a new computer. The computer has the following hardware configuration：  2.4-GHz processor  2 GB of RAM  512-MB video adapter  250-GB hard disk.  You are unable to view the following features of Windows Vista：  Thumbnails  Previews on folders  Transparent glass.  You need to be able to view the advanced visual features of Windows Vista.  What should you do？（）

• A、Press the ALT key and the TAB key simultaneously.
• B、Press the WINDOWS key and the TAB key simultaneously.
• C、Configure the system properties to optimize for applications.
• D、Configure the system properties to optimize for best appearance.