Which of the following is an example of the use of a device on the Internet of Things (IoT) ?
(A)A car alerts a driver that it is about to hit an object. (B)A hiker uses a G P S watch to keep track of her position. (C)A refrigerator orders milk from an online delivery service when the milk in the refrigerator is almost gone. (D)A runner uses a watch with optical sensors to monitor his heart rate.
C