If an authorized user fails to disarm an intrusion system during its entry delay countdown, what happens?

When an authorized user fails to disarm an intrusion system during its entry delay countdown, the alarm system is activated. This feature is designed as a security measure to alert the monitoring service or local authorities that an intrusion may have occurred. The entry delay is intentionally built into the system to allow authorized users a brief period to enter a code or take action to disarm the system after returning home. If the system is not disarmed within that set time frame, it assumes that an unauthorized entrance might be taking place, triggering the alarm as a notification of potential security breaches. Thus, activating the alarm serves to deter potential intruders and notify individuals responsible for responding to incidents.

The other options, such as automatic system resets, logging of entries, or entering a sleep mode, do not accurately reflect the intended function of an intrusion detection system in response to a failure to disarm during the entry delay.