What represents an online professional network for discussing various topics?

A listserv refers to an automated mailing list that allows individuals to send messages to a group of subscribers via email. It serves as a platform where members can engage in discussions about a wide range of topics, share information, ask questions, and provide support. This form of online communication creates a professional network where individuals with common interests can interact and exchange ideas efficiently, regardless of their physical location.

Other options do not fit this context. A place-bound conference refers to in-person gatherings that require participants to be present at a specific location, while an application service provider generally refers to a business that offers software applications over the internet. A wide area network connects computers over large distances, facilitating data transfer but does not serve as a platform for discussion. Therefore, the characteristics of a listserv align perfectly with the concept of an online professional network.