. . . . . . . . layer is the communication layer that connects the IoT devices with WAN.

Solution(By Examveda Team)

The communication layer that connects IoT devices with WAN (Wide Area Network) is the internet layer. This layer is responsible for facilitating communication between devices over the internet, enabling them to transmit and receive data to and from remote locations.
Option B: The application layer is higher in the communication stack and deals with the protocols and services that applications use to communicate with each other.
Option C: The sensor layer is typically the lowest layer, consisting of physical sensors and devices that collect data. It is not directly responsible for connecting devices to the WAN.
Option D: The network layer is generally responsible for routing and forwarding data packets within a network, but it doesn't specifically handle the connection of IoT devices to the WAN.
Hence, the correct answer is Option A: internet layer. This layer facilitates the connection of IoT devices to the wider internet, enabling them to communicate over a larger network.