Final answer:
The description that best fits a control and react IoT application is 'Proactive monitoring and response,' as such applications actively monitor and immediately respond to circumstances without the need for human intervention.
Step-by-step explanation:
The question asks, "Which of the following descriptions best describes a control and react IoT application?" The correct answer to this question is (a) Proactive monitoring and response. This is because a control and react Internet of Things (IoT) application is designed to actively monitor systems or environments and take immediate action based on the data it collects. For example, a smart thermostat system can proactively monitor room temperature and adjust the heating or cooling as needed without human intervention.
The other options do not accurately describe a control and react IoT application: (b) Passive data collection implies that the data is simply gathered without immediate action, (c) Offline data storage refers to where data is held rather than how it's used, and (d) Limited connectivity describes a state of the system’s network rather than its operational mode.