You must upgrade all Log Collectors in a collector group at the same time to avoid losing log data
https://docs.paloaltonetworks.com/pan-os/10-2/pan-os-upgrade/upgrade-panorama/deploy-updates-to-firewalls-log-collectors-and-wildfire-appliances-using-panorama/deploy-an-update-to-log-collectors-when-panorama-is-internet-connected
I think it is A, there is no mention of a log collector group in the question. You upgrade log collectors one at a time and verify each upgrade is good before moving to the next one.
C - Upgrade all Log Collectors in a collector group at the same time to avoid losing log data
https://docs.paloaltonetworks.com/pan-os/10-2/pan-os-upgrade/upgrade-panorama/deploy-updates-to-firewalls-log-collectors-and-wildfire-appliances-using-panorama/deploy-an-update-to-log-collectors-when-panorama-is-internet-connected
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