Home automation systems may consist of many systems that are connected to one another ___.

• A. directly
• B. wirelessly
• C. directly and indirectly
• D. indirectly

Answer: (C)

In home automation, devices connect through multiple paths, using both direct links and through intermediaries. Some devices talk straight to a central controller or to a common hub, while many others communicate via that hub or through the network, making the interaction indirect. So, saying that systems may be connected to one another directly and indirectly best describes how these networks operate in practice, covering wired or wireless direct links as well as indirect communication through a hub, gateway, or cloud.

If you only said directly, you’d miss the common indirect paths via controllers or networks. If you only said wirelessly, you’d ignore wired connections that also exist. If you said indirectly, you’d miss direct device-to-device or direct hub connections that can happen.