Question

question # 9
multiple choice
a service for smart homes relies on appliances and systems that can talk to each other. what does a smart appliance have that makes this possible?
robots
unique identifier
internet of things
the cloud

Explanation:

Smart appliances in a smart home service need a way to communicate with each other. A unique identifier allows each appliance to be recognized and interact within the network. Robots are not a general feature for all smart appliances to communicate. The Internet of Things (IoT) is the concept of connected devices but not a specific feature an appliance "has" in the context of the question. The cloud is a storage and processing medium but not what directly enables appliance - to - appliance communication.

Answer:

unique identifier