Which transfer mode is available only in releases 8.1 and later when upgrading the controller software?

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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