An administrator wants to upgrade a firewall HA pair to PAN-OS 10.1. The firewalls are currently running PAN-OS 8.1.17.
Which upgrade path maintains synchronization of the HA session (and prevents network outage)?
A . Upgrade directly to the target major version
B . Upgrade one major version at a time
C . Upgrade the HA pair to a base image
D . Upgrade two major versions at a time
Answer: D
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