Which of these situations describes the creation of a computer network?

Choose $1$ answer:

A software developer sets up a multi$-$monitor setup in their office. Their desktop computer outputs to three monitors that are arranged horizontally across his desk. One monitor shows their browser, one shows their code editor, and one shows their terminal.

A programmer develops an interactive poster to help their baby learn the alphabet. The poster displays each letter of the alphabet with a push button underneath. The push buttons are input devices for an Arduino microcomputer. When the Arduino detects a push, it randomly picks a word starting with that letter and sends an audio file to a set of embedded speakers.

A photographer organizes thousands of photographs and videos on their computer's hard drive. They create a hierarchical structure of folders with child folders nested many levels deep.

A college campus creates multiple computer labs in different parts of the campus and connects the labs to each other with underground fiber optic cables. Students can save their file on a computer in one lab and still access their files from another lab.