According to the Juniper documentation1, a predefined device profile is a configuration template that is shipped with Apstra software and supports most qualified Juniper devices. A predefined device profile cannot be changed, since any changes would be discarded and overwritten when you upgrade the Apstra server version. If you want to customize a predefined device profile, you can clone and edit it instead. Therefore, the correct answer is A. The changes you make to a predefined device profile will be discarded and overwritten when upgrading the Apstra server version. References: Edit Device Profile | Apstra 4.2 | Juniper Networks
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