The four main structural elements of a computer system are:Select one:A.Processor, Main Memory, I/O Modules and System BusB.Processor, Registers, Main Memory and System BusC.Processor, Registers, I/O Modules and Main MemoryD.Processor, I/O Modules, System Bus and Secondary Memory

The correct answer is A. Processor, Main Memory, I/O Modules and System Bus. These are the four main structural elements of a computer system.

1. Processor: This is the brain of the computer. It performs most of the processing inside the computer. It makes decisions, runs programs and directs the operations.

2. Main Memory: This is where the computer stores data and instructions. It is a temporary storage area. It holds the data and instructions that the processor needs.

3. I/O Modules: These are used for communication between the computer and its external environment. The user can input data into the computer through input modules and receive output through output modules.

4. System Bus: This is the communication system that transfers data between different components of a computer. It connects the processor, main memory, and I/O modules.