正解:C
The correct command set is Option C, which includes the command fcdomain fcid persistent vsan 120. This command ensures that the Fibre Channel IDs (fcid) are saved across reboots for VSAN 120, meeting the requirement for persistent Fibre Channel IDs. The other commands in Option C are used to set the WWN and fcid as per the given requirements.
References: For a comprehensive explanation, please refer to the "Implementing and Operating Cisco Data Center Core Technologies (DCCOR)" course, which covers the skills and technologies needed to implement data center compute, LAN, and SAN infrastructure, including the management of Fibre Channel IDs