Which transfer mode is available only in releases 8.1 and later when upgrading the controller software?
A . SFTP
B . FTP
C . TFTP
D . HTTP
Answer: D
Explanation:
Reference: https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-3/config-guide/b_cg83/ b_cg83_chapter_0101.html