Which AP mode lets the AP act like a WLAN client to associate and help diagnose client connectivity issues?

Sensor mode allows an Access Point (AP) to act as a WLAN client, associating with another AP to test connectivity and diagnose client-related issues from a client's perspective. This is useful for troubleshooting problems like authentication failures or poor signal strength that clients might experience. Client mode typically refers to an AP acting as a client to connect to a wireless network, but not specifically for diagnostic purposes. SE-connect mode (Spectrum Expert Connect) is used for spectrum analysis with a dedicated spectrum analyzer. Sniffer mode captures wireless frames for analysis but doesn't associate with an AP as a client.