题目选项分析

In a "smart" home, security systems, heating units, televisions, and washing machines are all networked, and the homeowner can send commands by phone to each

appliance, which thereby activates or deactivates

In a "smart" home, security systems, heating units, televisions, and washing machines are all networked, and the homeowner can send commands by phone to each

appliance and thereby activate or deactivate