You upgrade 6 MPS compliant computers from Windows NT Workstation 4.0 to Windows 2000 Professional computer. Each computer has two 550 MHz processors. The computers are used for high-resolution graphics applications that require exceptional performance. After the upgrade users complain that the processing time for graphic applications is much slower than before.    What should you do?（）

• A、Use Device Manager to enable AGP bridge controller. 
• B、Use Device Manager to install the MPS compliant drivers for the second processor. 
• C、Use Device Manager to install ACPI compliant driver for second processor. 
• D、During startup press F8 and install MPS compliant driver for second processor.