Which of the following is false?

I. In the client$-$server paradigm, the server is always on and has a permanent IP address.

II$.$ In the client$-$server paradigm, the client may be intermittently connected.

III. In the client$-$server paradigm, the clients may have dynamic IP addresses.

IV$.$ In the client$-$server paradigm, the clients may communicate with each other when necessary.