The correct answer is: A. Router.
A router is a networking device that forwards data packets between computer networks. Routers perform the traffic directing functions on the Internet. Data sent through the internet, such as a web page or email, is in the form of data packets. A packet is typically forwarded from one router to another router through the networks that constitute an internetwork until it reaches its destination node.
A modem is a device that modulates and demodulates signals. It is used to connect a computer to a
telephone line in order to access the internet. Modems convert digital signals from the computer into analog signals that can be transmitted over the telephone line, and vice versa.A switch is a networking device that connects devices together
on a computer network by using packet switching to receive, process and forward data to the destination device.A server is a computer program or a computer system that provides a service to other computers, known as clients. Servers can provide a variety of services, such as file sharing, email, and web hosting.