Multiple organizations operating in the same vertical want to provide seamless wireless access for their employees as they visit the other organizations. Which of the following should be implemented if all the organizations use the native 802.1x client on their mobile devices?

A. Shibboleth

B. RADIUS federation

C. SAML
D. OAuth
E. OpenID connect

Explanation: http://archive.oreilly.com/pub/a/wireless/2005/01/01/authentication.html