Which of the following are the main components of a Wi-Fi Protected Setup (WPS) protocol architecture?
Each correct answer represents a part of the solution. Choose all that apply.

A.
Authenticator

B.
Registrar

C.
Supplicant

D.
Enrollee

Explanation:
Wi-Fi Protected Setup (WPS) is a standard for easy and secure establishment of a wireless home network, created by the Wi-Fi Alliance. The WPS protocol defines three types of devices in a network. Registrar. A device with the authority to issue and revoke credentials to a network. A Registrar may be integrated into an AP, or it may be separate from the AP. Enrollee. A device seeking to join a wireless LAN network. Authenticator. An AP functioning as a proxy between a Registrar and an Enrollee. The WPS standard defines three basic scenarios that involve these components.
1. AP with internal registrar capabilities configures an Enrollee STA.In this case, the session will run on the wireless medium as a series of EAP request/response messages, ending with the AP disassociating from the STA and waiting for the STA to reconnect with its new configuration (handed to it by the AP just before).
2. Registrar STA configures the AP as an Enrollee. This case is subdivided in two aspects. first the session could occur on both a wired or wireless medium, and second the AP could already be configured by the time the Registrar found it. In the case of a wired connection between the devices, the protocol runs over UPnP, and both devices will have to support UPnP for that purpose.
3. Registrar STA configures Enrollee STA.In this case, the AP stands in the middle and acts as an Authenticator, meaning it only proxies

Answer C is incorrect. Supplicant is one of the main components of an IEEE 802.1X/EAP framework.

Reference. http.//en.wikipediA.org/wiki/WiFi_Protected_Setup