Final answer:
Sydney's keyboard and mouse are both input components (option d) of a computer, used to provide data and control signals to the computer's processing system. These devices allow the user to communicate with the computer, much like the senses send information to the brain for processing.
Step-by-step explanation:
The keyboard and mouse that Sydney bought for her computer are both examples of input components. In computing, an input device is a piece of equipment used to provide data and control signals to an information processing system. Sydney's keyboard is used to input text and commands into the computer, whereas the mouse allows her to navigate the computer's user interface and input commands through clicks and movements. These devices are essential for the computer to receive information from the user, which the computer's central processing unit (CPU) can then process.
Comparing the brain to a computer, we can say the brain processes information gathered by the senses and stored in memory, and these processes are similar to computational operations. Just as the brain needs input (information received through senses) to produce output (actions, thoughts, speech), a computer requires input devices like a keyboard and mouse to receive data which it then processes to produce outputs visible on the monitor or in print form.