There is a step missed on all of these answers, "Policy Optimizer" should be accessed before selected "Rule Usage"
https://docs.paloaltonetworks.com/pan-os/9-1/pan-os-admin/app-id/security-policy-rule-optimization/policy-optimizer-concepts/sorting-and-filtering-security-policy-rules
You can filter Security policy rules to see all the port-based rules, which have no applications configured (Policies > Security > Policy Optimizer > No App Specified).
You can also filter to see all the rules that have applications configured but traffic doesn’t hit all of the applications (Policies > Security > Policy Optimizer > Unused Apps).
The correct answer should be "A" No App Specified
https://docs.paloaltonetworks.com/pan-os/9-1/pan-os-admin/app-id/security-policy-rule-optimization/migrate-port-based-to-app-id-based-security-policy-rules
In PanOS 10 it should be: Policies ---- Security -------- Policy Optimizer ------------ Rules without App Controls
https://docs.paloaltonetworks.com/pan-os/10-0/pan-os-web-interface-help/policies/policies-security/security-policy-rule-usage.html
No App Specified—Rules that have the application set to any, so you can identify port-based rules to convert to application-based rules.
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