What type of device is critical for establishing a network?

Establishing a network involves various devices that each fulfill essential roles, making all the options significant contributors to network functionality.

Fuses protect electrical circuits by interrupting the flow of electricity during faults, ensuring that devices don't get damaged due to overloads. While they are critical for safety, they do not directly facilitate network connectivity.

Servers play a central role in networks by hosting applications, data, and services that can be accessed by other devices on the network. They manage resources, provide shared access, and help in data management and storage, thereby making them crucial for a network's operational aspect.

Modems are vital for connecting a network to the internet or other networks. They modulate and demodulate signals for data transmission, acting as a bridge between the digital data in a computer and the analog signal required for various communication lines.

Choosing "All of these" reflects an understanding that a comprehensive network setup requires multiple elements working together. Each device plays a unique role, and their combined functionality is what allows a network to operate effectively.