What is a central monitoring station requirement for alarm systems operated by Illinois contractors?

• A. The monitoring must be performed by a UL-listed or otherwise approved central station, with reliable communications
• B. Monitoring can be performed by a local security company without a central station
• C. Central monitoring is optional for residential systems
• D. The monitoring must be performed by a UL-listed or otherwise approved central station, with reliable communications and documented procedures

Answer: (D)