Sisters.
3 is the answer
The components that process data are located in the system unit
The Operating System
computer system
System unit
Hardware
system unit
mouse keyboard system
To not damage the computer components.
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.)
"System" in this case means that there are various components, which work together.