问题详情

指定同/异步串口1和2的备份优先级分别为10和20的配置为()
A.backup interface 1 10; backup interface 2 20
B.backup interface serial 1 10; backup interface serial 2 20
C.backup interface 1 priority 10; backup interface 2 priority 20
D.backup interface serial 1 priority 10; backup interface serial 2 priority 20请帮忙给出正确答案和分析，谢谢！