Question: What is one of the primary drivers for the need of secure mechanisms to dynamically establish or refresh credentials and subscriptions in IoT devices?
Option 1: High-end smartphones
Option 2: IoT devices with long life spans that can change ownership several times
Option 3: UAVs used in industrial automation
Option 4: Factory automation systems
Explanation: The correct answer is Option 2 because the text states that IoT devices with long life spans, which can change ownership several times, drive a need for secure mechanisms to dynamically establish or refresh credentials and subscriptions. This highlights the importance of security in IoT devices that are used across multiple owners and have extended lifecycles.