The only answer is B as the question is: "that would back up the secondary image to a secure remote repository". You are backing up the image to a secure remote repository.
You are not copying from sftp to secondary which is the option C
A is incorrect because backup is not a command for CX switches
B is correct
C is incorrect because the copy is from the switch to the remote server
D is incorrect because there is no need of credentials for tftp server
I have to retract my previous comment as I seem to have misread the question.
The correct answer is B. You are asked to copy the secondary image from the switch to a secure repository, so this is the correct syntax to achieve that
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