Which system is part of the three basic systems in public safety?

The radio system is a fundamental component of public safety communication. It provides a reliable, real-time means of communication that is essential for responding to emergencies, coordinating operations, and ensuring that first responders can communicate effectively with each other and with dispatch centers. In many situations, such as natural disasters or major incidents, radio systems can function in environments where other forms of communication might fail due to infrastructure damage.

The other options, while important in various contexts, do not fit the specific requirements and functionality needed in emergency response scenarios. The postal service is primarily for the delivery of mail and packages, television broadcasting is designed for media dissemination rather than urgent communication, and online communication, although valuable, does not offer the immediacy or reliability often required in public safety situations, particularly in areas with limited internet access. Thus, the radio system is recognized as an essential asset for effective public safety operations.