Which step supports disaster recovery and should be performed first when upgrading an IOS system image on a Cisco router?

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Which step supports disaster recovery and should be performed first when upgrading an IOS system image on a Cisco router?

Delete the current image from flash memory.
Copy the current image from the router to a TFTP server.
Use the boot system command to configure the router to load the new image.
Configure the router to load the new image from the TFTP server.

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