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Palo Alto Networks Certified Network Security Engineer (PCNSE) · Palo Alto Networks
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A is correct
A is correct You are unable to downgrade from PAN-OS 8.1 to an earlier PAN-OS release if variables are used in your template or template stack configuration. Variables must be removed from the template and template stack configuration to downgrade.
It took me a while to actually find a PANOS release note from 8.1. https://docs.paloaltonetworks.com/content/dam/techdocs/en_US/pdf/pan-os/8-1/pan-os-new-features/pan-os-new-features.pdf