Answer:
A. Request timeout.
Explanation:
The end devices like the computer systems in a network seeks to share resources with one another and/ or request resources from central server.
With this, there are two ways computers in a network can communicate. They are peer to peer network communication and client-server network communication.
The client-server communication requires a dedicated central server where computers in the network require data. Peer to peer describes a network where computers serve as both client and server to each other.
Request timeout is a message sent to a source when the time to live period (TTL) of a packet expires.
