What is required to pair an unpaired AP device?

To successfully pair an unpaired AP (Access Point) device, a pairing passphrase that matches the AP device is essential. This passphrase serves as a security measure ensuring that only authorized devices can establish a connection. When a new AP is added to a network, it typically requires verification through this passphrase, allowing it to authenticate itself with the other devices on the network and ensuring that it is recognized as a legitimate component of the system. The use of a matching passphrase enhances security by preventing unauthorized devices from accessing the network.

This process is part of the broader security protocols in wireless networking, emphasizing the importance of secure communications and device integrity. The other options, while potentially relevant in different contexts, do not directly address the specific requirement for pairing an unpaired AP device, which makes the pairing passphrase the correct choice in this scenario.