阅读以下说明，回答问题1至问题3，将解答填入答题纸对应的解答栏内。
【说明】
如图4-1所示，三台交换机都为三层交换机，根据题目要求回答下面的问题。
【问题3】（1分）
在SW3上的全局地址池vlan20中配置了lease day 1的参数，但是在查看全局地址池vlan20中的配置时，发现该参数并不存在，其原因是_（15）_。
（15）备选答案
A. 该参数语法错误，在配置过程中出现了语法错误导致的报错，所以配置没有生效
B. 该参数并不属于全局DHCP地址池下的参数，所以无法在全局DHCP地址池下配置
C. 该参数为DHCP地址的默认参数，即使手工配置了也不会显示出来
D. 交换机的该版本有bug，导致配置该参数无法显示
正确答案及解析
正确答案
解析
（15）C
【解析】
＜Huawei>system-view
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