Which of the following uses pair authentication to provide a wireless connection between two devices?

802.11n is a Wi-Fi standard operating on 2.4 GHz and 5 GHz bands for network access; it uses network authentication (WPA2) rather than device-to-device pairing.

Bluetooth requires a pairing procedure in which both devices exchange and verify a shared link key or passkey, authenticating each device to the other before data can be exchanged. This mutual authentication is a fundamental feature of the Bluetooth protocol and distinguishes it from other wireless technologies that do not require device-level pairing.

Infrared (IrDA) uses line-of-sight optical communication and does not implement a pairing/authentication process.

Cellular technology connects devices to carrier base stations using SIM-based authentication, not device-to-device pair authentication.