Which of the following statements is true of an Internet service provider $($ISP$)?$

It provides a legitimate public Internet address to a device or LAN, serving as a user's gateway to the Internet.

It facilitates a one$-$way information transfer process between a user's computer and the Internet.

It allows a user to communicate directly through the Internet without requiring a wireless medium of communication.

It separates the phone signals from computer signals on a digital subscriber line $($DSL$)$ at a user's location.