The primary difference between a client-server network and a peer-to-peer (P2P) network is that the client-server model has a central server that manages resources and provides services to client machines, while in a peer-to-peer network, all nodes (or peers) share resources directly with each other without a central server.
Given the options you provided, the correct response would be:
The client-server model has a central server.
The other statements about wired or wireless connections are not accurate representations of the fundamental differences between these network types. Both client-server and peer-to-peer networks can operate over wired or wireless connections.