The Edge layer in IoT relates to the analytics and pre-processing services. Which of the following helps clarify the essence of edge computing? Select one: a. Components that include physical sensors and actuators that are connected to IoT devices and the IoT devices themselves b. Basic pre-processing tasks like filtering and aggregation of data are performed on the device c. After the data has been prepared, it is sent upstream for further processing, storage, and use within cloud applications d. The Edge layer provides secure communication channels and message integrity (by using encryption).