CPU main frequency is also called clock frequency. The unit is megahertz (MHz) or gigahertz (GHz2). Which of the following is the function?

CPU main frequency is also called clock frequency. The unit is megahertz (MHz) or gigahertz (GHz2). Which of the following is the function?
A . Used to indicate the speed of CPU operations and data processing
B . Determine the bus data transmission speed
C . Determines the running speed of the entire motherboard
D . Determine the speed of data exchange between CPU and memory

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Answer: A