What is the interrogation rate of a 2-way radio used for line security?

The correct choice regarding the interrogation rate of a 2-way radio used for line security is 1/200 sec. This rate indicates how frequently the radio can send and receive signals, which is crucial for maintaining real-time communication and ensuring a prompt response to security breaches or alarms. A faster interrogation rate means that the system can react quickly to any disturbances, which is essential in line security applications where various signals must be continuously monitored.

In comparison, other rates like 1/100 sec, 1/300 sec, and 1/400 sec do not correspond to standard rates used in the context of 2-way radio communication for security purposes. Each of these alternatives suggests a different frequency of communication that does not align with the operational efficiency required for effective line security monitoring. Specifically, 1/200 sec strikes an optimal balance between responsiveness and system performance.