Refer to the exhibit.

Use a browser that supports keys of 2048 bits resolves the issue because the root cause belongs to the management and operations layer around ACI, APIC, certificate. Cisco DCIT troubleshooting requires identifying whether the issue is caused by AAA, RBAC, certificate trust, SNMP access, firmware workflow, license/feature state, or lifecycle registration. The selected option changes the specific item that the platform checks before allowing the operation to complete. The incorrect options either touch data-plane forwarding, change an attribute that is not evaluated for the task, or would create unnecessary disruption. A correct operational fix should be measured by the management result, not just by interface status. The engineer should repeat the login, registration, certificate access, or fault workflow, then verify the audit log and effective permissions. That method confirms the platform is behaving as Cisco expects and that the correction is durable across subsequent operations.