The CPU frequency is also called the clock frequency, the unit is megahertz (MHz) or gigahertz (GHz2), its role is:

The CPU frequency is also called the clock frequency, the unit is megahertz (MHz) or gigahertz (GHz2), its role is:
A .  Used to indicate the speed of CPU calculation and data processing
B .  Determine the transmission speed of bus data
C .  Determine the running speed of the whole mainboard
D .  Determine the speed of data exchange between CPU and memory

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Answer: A