Ans B ; wi-fi protected access
Wi-Fi Protected Access (WPA) is a security standard to secure computers connected to a Wi-Fi network. Its purpose is to address serious weaknesses in the previous system, the Wired Equivalent Privacy (WEP) standard.
Wi-Fi Protected Access (WPA) and WPA2 are concurrent security standards. WPA addressed the majority of the IEEE 802.11i standard; and the WPA2 certification achieved full compliance. However, WPA2 will not work with some older network cards, thus the need for concurrent security standards.