Explanation:

The correct option is (D) All devices involved in processing information including the CPU, memory and storage. Hardware encompasses all the physical, tangible components of a computer system that are essential for its operation. This includes not only input and output devices but also the core components responsible for processing and storing data. (A) 'All devices used to input data into a computer' (e.g., keyboard, mouse) is only a subset of hardware. It excludes output, processing, and storage components. (B) 'Sets of instructions that a computer runs or executes' describes software, which is intangible and distinct from hardware. (C) 'The computer and all the devices connected to it that are used to input and output data' is a better definition than (A), as it includes the main computer and I/O peripherals. However, it implicitly focuses on external or peripheral devices and might not explicitly cover internal processing units like the CPU and memory as comprehensively as option (D). (D) This option provides the most comprehensive and accurate definition of hardware, covering input, output, processing (CPU), memory (RAM), and storage devices, which are all physical components integral to a computer's function.