The mystery of the slow CPU

Your laptop computer is rated to run at 2 GHz, but the information in the Control Panel’s System applet shows the CPU running at 900 MHz. What might explain this discrepancy?

A) The laptop was falsely advertised as a 2GHz processor but actually has a 900 MHz processor.

B) The laptop is saving power and minimizing heat by slowing down the processor when it’s not under a heavy load.

C) The System Information screen is displaying the incorrect processor speed because of a well-known Windows bug.

D) The CPU uses a multiplier to reach 2 GHz, but the System applet only shows the CPU speed prior to calculating the multiplier.