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Sisters.
system unit is used to control the parts of the computer system
3 is the answer
The components that process data are located in the system unit
The Operating System
computer system
System unit
mouse keyboard system
Hardware
system unit
Some major components of a computer system are the following:The CPUThe arithmetic unitMemoryThe processorInputOutputHardwareSoftware(Some of these overlap. For instance, a CPU is a processor, and is also part of the hardware of a computer.)
To not damage the computer components.