The correct answer is C. Installing.
A rule is a principle or regulation governing conduct within a particular area of activity. A programme is a set of instructions that a computer follows to perform a task. Installing is the process of putting something in place or setting it up. A schedule is a list of events or activities that are planned to happen at specific times.
In the context of the question, installing a computer is the process of putting the computer together and setting it up so that it can be used. This includes connecting the computer to power and peripherals, installing the operating system and other software, and configuring the computer’s settings.
The other options are incorrect because they do not accurately describe the process of installing a computer. Rules are not involved in the installation process, and a programme is not the same thing as a computer. A schedule may be used to plan the installation process, but it is not the installation process itself.