What is an available command on an Aruba AOS-CX switch that would back up the secondary image to a secure remote repository?

What is an available command on an Aruba AOS-CX switch that would back up the secondary image to a secure remote repository?
A . backup secondary sftp://[email protected]/GL.10.04.0003.swi
B . copy secondary sftp://[email protected]/GL.10.04.0003.swi
C . copy sftp://[email protected]/GL.10.04.0003.swi secondary
D . copy secondary tftp://[email protected]/GL.10.04.0003.swi

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Answer: B