The correct answer is: B. host
A host is a computer that is connected to the internet and can be accessed by other computers. It can be used to store files, run programs, and provide services to other computers.
A switch is a device that connects multiple computers together on a local area network (LAN). It forwards data packets between computers on the LAN based on the destination address in the packet header.
A gateway is a device that connects two or more networks together. It translates data packets from one network protocol to another so that they can be transmitted on the other network.
A repeater is a device that amplifies and regenerates a signal so that it can be transmitted over a longer distance.
In the context of the question, the web server is a computer that is connected to the internet and can be accessed by other computers. It stores files that make up websites, and it runs programs that allow users to view those websites. Therefore, the web server is also known as a host.