Which function is provided by a wireless LAN controller?

A wireless LAN controller (WLC) centralizes the management of multiple access points (APs) and is crucial for optimizing wireless network performance, especially in dense environments. One key function is managing RF interference. WLCs can dynamically adjust AP channels and power levels to minimize co-channel interference and improve overall network efficiency and client connectivity. "Mitigates threats originating from the internet" is incorrect because this is typically handled by firewalls or intrusion prevention systems, not WLCs. "Performs Layer 3 routing between wired and wireless devices" is incorrect; while some WLCs can perform basic routing, their primary role is not Layer 3 routing, which is usually handled by routers or Layer 3 switches. "Assigns IP addresses to wired clients" is incorrect; IP address assignment is performed by a DHCP server, which can be a router, server, or even a multi-functional switch, but not a WLC.