Fortify Your Cyber Fortress: Conquer the 2025 NDE Practice Exam! 🚀🔐

The correct answer is the process layer, which is integral to IoT systems as it encompasses the business logic and the operational procedures that define how data is processed and actions are triggered within an IoT environment. In this scenario, the process layer would include the automations and controls that enable the sprinkler system to be activated remotely based on certain conditions or commands. This layer serves as a bridge between the application's functioning (how the system interacts with users) and the devices themselves (the hardware that executes actions).

In contrast, the network layer focuses on the transmission of data between devices and does not involve direct interaction with the devices' functionalities. The application layer deals with the end-user applications that can analyze the data or provide user interfaces, but it doesn't typically manage the physical actions like turning on a sprinkler. The device layer pertains to the hardware components and their capabilities, but does not encompass the logic that governs the activation of those devices. Therefore, the process layer is the most accurate selection as it directly relates to the functionality of operating and controlling the devices based on defined processes or conditions.