The correct answer is D. If the ZTP operation detects that the switch configuration is different from the factory-default configuration, the ZTP operation ends. HPE Aruba Networking AOS-CX documentation explains that the ZTP process starts when the switch boots with the factory-default configuration. During the ZTP process, if the switch detects that its configuration is different from the factory-default configuration, the ZTP operation ends and the switch must be configured at the installation site. This directly addresses the customer’s concern: ZTP is intended for new or factory-default switches, and it should not overwrite or change switches that have already been manually configured or deployed. Option A is incorrect because the end condition is not based on a TFTP server detecting a serial-number configuration file. Option B is incorrect because being added to Central is not the stated stopping condition. Option C describes force provisioning, which can intentionally start provisioning behavior, but it does not address the concern about protecting already configured switches.