Which AireOS release is the first to support New Mobility on the Cisco 2504 WLC? 

Answer options:

A. 8.1.x
B. 7.6.x
C. 7.4.x
D. 8.0.x

B

Please refer to this link: http://www.cisco.com/c/en/us/td/docs/wireless/controller/7-6/configuration-guide/b_cg76/b_cg76_chapter_010010110.html