Backing up the switch configuration to a remote Linux SFTP server requires using the copy command with the correct protocol (SFTP in this case), username, server IP, filename, and optionally the VRF to route management traffic.
Option A uses SCP and vrf default but the question mentions SFTP server, so SFTP protocol should be used.
Option B is a server-side command (not the switch).
Option C correctly uses copy startup-config sftp://user@192.168.1.100/switch_config.cfg vrf mgmt which backs up the startup-config via SFTP using the management VRF.
Option D is also a server-side command.
Using vrf mgmt is required because the management IP is in a separate VRF on CX switches.
[References:, , ArubaOS-CX Configuration Guide - Copy and File Transfer, , Aruba CX VRF and Management Plane Concepts, , HPE Aruba Networking SFTP/SCP Backup and Restore Examples]
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