单选题设置作为主接口的逻辑通道呼叫8次仍未成功为切换到备份接口，每隔60秒检查一次主逻辑通道是否恢复Up，这样的配置应为（）Abackup state-down8 state-up60Bbackup state-down60；backup state-up8Cbackup state-down8；backup state-up60Dbackup state-down8；backup state-uptime60
单选题
设置作为主接口的逻辑通道呼叫8次仍未成功为切换到备份接口，每隔60秒检查一次主逻辑通道是否恢复Up，这样的配置应为（）
A
backup state-down8 state-up60
B
backup state-down60；backup state-up8
C
backup state-down8；backup state-up60
D
backup state-down8；backup state-uptime60
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