Final answer:
The correct example of input hardware from the given options is d. keyboard. Input devices allow users to enter data into the computer, unlike the printer which is an output device or the microprocessor chip and network interface card which are internal components.
Step-by-step explanation:
An example of input hardware is d. keyboard. Input hardware devices are those that allow users to input data into a computer. Common input devices include keyboards, mice, scanners, and microphones. These devices allow users to interact with the computer by sending data to the system. On the other hand, output devices like printers output data from the computer, and components like microprocessor chips and network interface cards are internals that process data and facilitate connectivity but do not allow for user data entry.
In this list, the printer is an output device and the microprocessor chip and network interface card are internal hardware components. Therefore, the correct input hardware from the given options is solely the keyboard.