The correct answer is b) software.
Software refers to the programs and operating information used by a computer. It includes applications, operating systems, and other types of programs that perform specific tasks. In contrast, hardware refers to the physical components of a computer, such as the CPU and memory, while a server is a type of computer or software designed to provide services to other computers over a network. Lastly, a network is a group of interconnected devices that can communicate with one another.