A probe response follows a client's probe request. Which 802.11 frame type is this?

A probe response is an 802.11 management frame. Management frames are used for network maintenance and control, such as associating, authenticating, and deauthenticating devices, as well as for beaconing and probing. When a client sends a probe request (also a management frame) to discover available access points (APs), an AP responds with a probe response to advertise its capabilities and supported rates. Data frames carry the actual user data. Control frames assist in the delivery of data frames, like acknowledgments (ACKs) and Request to Send/Clear to Send (RTS/CTS). Action frames are a subcategory of management frames that allow stations to request specific actions, but a probe response is a fundamental management frame itself.