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？（）ARJ-31xBRJ-11CRS-232DDB-9
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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