Which of the characteristics below are associated with a client$-$server approach to structuring network applications $($as opposed to a P$2$P approach$)?$

Question $4$ options:

There is a server that is always on$.$

There is not a server that is always on$.$

There is a server with a well known server IP address.

A process requests service from those it contacts and will provide service to processes that contact it$.$

HTTP uses this application structure.