In a network, each node connected to the network communicates directly with every other node.

I am definitely sure that correct answer looks like this: In a peer-to-peer network, each node connected to the network communicates directly with every other node. Peer-to-peer or P2P network is a network in which every client connected to another client and they are depended on each other. When one of them has connection problems, another one gets them too.

Social networking sites d. online forumsthe first recognizable social media site,  six  degrees, was created in 1997. it enabled users to upload a profile and make friends with other users. in 1999, the first blogging sites became popular, creating a social media sensation that's still popular today.