正解:B
To schedule the firmware upgrade of the Red1 and Red2 leaf switches with the requirements of minimal upgrade time, no service impact, and parallel upgrade, SchedulerPolicy1 and SchedulerPolicy2 with a one-time window trigger that has maximum concurrent nodes 2 should be used. This allows both Red1 and Red2 to upgrade simultaneously within the same maintenance window, thus minimizing the time and avoiding any service disruption.
References := Further details can be found in the Cisco Data Center Core Technologies documentation