In a P$2$P network,

$\_\_\_$ The overlay network and the physical network form the client$-$server paradigm.

$\_\_\_$ The peers in an overlay network are able to communicate with each other regardless of the actual topology of the underlying physical network.

$\_\_\_$ An overlay network has no connection to the physical network.

$\_\_\_$ No peers can be added to the overlay network once it is formed.