Which of the following provides authentication, encryption and data integrity for wireless devices?

Password Authentication Protocol (PAP) is an insecure authentication protocol used primarily in PPP, which provides only password authentication without encryption or data integrity for wireless devices.

WAN stands for Wide Area Network, which is a type of network that covers a broad area, but it is not a security protocol that provides authentication, encryption, and data integrity.

WAP stands for Wireless Application Protocol, a technical standard for accessing information over a mobile wireless network. While WTLS is part of WAP, WAP itself is not the security protocol that provides these specific security features.

Wireless Transport Layer Security (WTLS) is the security layer of the Wireless Application Protocol (WAP) stack. It provides critical security features for wireless devices, including authentication to verify identities, encryption to protect data confidentiality, and data integrity to ensure data has not been tampered with during transmission.