The correct answer is: B. network and cloud
A gateway is a device that provides a connection between two or more networks. In the context of IoT, a gateway typically connects a local network of devices to the cloud. This allows the devices to be managed and monitored remotely, and it also allows them to access cloud-based services.
Option A is incorrect because the cloud is not a network. The cloud is a collection of servers that are located remotely and that are used to store data and run applications.
Option C is incorrect because the network is not a cloud. The network is the physical infrastructure that connects devices to each other.
Option D is incorrect because the controller is not a network. The controller is a device that manages the devices on a network.
I hope this helps! Let me know if you have any other questions.