An extended service set (ESS) is a type of wireless network that consists of two or more basic service sets (BSSs) interconnected to form a single subnetwork. Since the scenario mentions multiple access points using the same SSID and security settings, this allows for seamless client roaming and indicates an ESS configuration. The interconnection of multiple BSSs can also be indicative of an ESS, which enables the extension of the wireless network coverage area. A basic service set (BSS) consists of a single access point and associated wireless clients, which would not be sufficient in this multi-access point scenario. An independent basic service set (IBSS) refers to a peer-to-peer network setup without an access point, which does not apply here. Roaming, by itself, is a feature or behavior within a wireless network and does not denote the network's structural configuration.