You have a computer running Windows 2000 Professional. You have purchased a new USB scanner. You attached it to the USB port. When you go to device manager to see the status of the USB port， you find a USB controller there but with a yellow warning icon next to the host controller name. What should you do to resolve this problem？ （）

• A、Update the scanner drivers using certified drivers
• B、Enable the USB port in the computers BIOS again.
• C、Contact the maker or vendor for you system and obtain the current version of BIOS.
• D、Enable the USB hub controller in device manager.