单选题When installing a security system， which of the following connectors would be used to connect the security system to the telephone service demarcation？（）A RJ-31xB RJ-11C RS-232D DB-9
题目
单选题
When installing a security system， which of the following connectors would be used to connect the security system to the telephone service demarcation？（）
A
RJ-31x
B
RJ-11
C
RS-232
D
DB-9
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参考答案和解析
正确答案：
D
解析：
暂无解析