Which 802.11 management frame type is sent when a client roams between access points on the same SSID?

A Reassociation Request frame is sent by a wireless client to a new access point when it wants to roam within the same extended service set (ESS) without breaking the existing association with the network. This frame allows the client to update its association with the new AP, typically maintaining its existing IP address.

A Probe Request frame is sent by a client to discover available access points and their capabilities, usually during initial network discovery or when searching for a better signal.

An Authentication Request frame is the first step in establishing a connection to an AP, used to verify the client's identity.

An Association Request frame is sent after successful authentication to formally join the basic service set (BSS) of an AP, establishing data link layer connectivity.