Your portable computer has two 512-MB memory modules installed in the only two memory slots available.  You need to improve the speed of your computer.  What should you do？ （）

• A、Adjust the processor scheduling to optimize for background services.
• B、Connect a USB flash drive to the computer. Enable the ReadyBoost feature.
• C、Configure the virtual memory file to exist on the same drive as the operating system.
• D、Configure the local security policy setting of the computer to clear the virtual page file upon shutdown.