Not only is B,C correct but note the negative stance from Palo regarding Client Probing:
"Palo Alto Networks strongly recommends disabling client probing because it is not a recommended method of obtaining User-ID information in a high-security network."
https://docs.paloaltonetworks.com/pan-os/9-1/pan-os-admin/user-id/user-id-concepts/user-mapping/client-probing
According to New Docs it's B and C
https://docs.paloaltonetworks.com/pan-os/11-0/pan-os-admin/user-id/user-id-concepts/user-mapping/xff-headers#idf60a278d-2285-4b19-9cc3-95a4b88d5c51
https://docs.paloaltonetworks.com/pan-os/11-0/pan-os-admin/user-id/user-id-concepts/user-mapping/syslog#idee459093-72c1-4ca5-9e44-2c4f359090bb
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A (35%)
C (25%)
B (20%)
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