Which of the following refers to machines that perform tasks typically handled by humans?

The term that best refers to machines performing tasks typically handled by humans is automation. Automation encompasses a wide range of technology and systems that perform tasks with minimal human intervention, and this can involve various forms of technology, including robotics and smart technologies.

While artificial intelligence pertains to the capability of machines to mimic intelligent human behavior, it is a broader term that does not exclusively focus on the physical tasks that machines can perform. Robotics specifically refers to the design and use of robots, which are often a component of automation systems. Smart technology encompasses devices that can communicate and control functions, but again, it is a broader concept than just performing tasks typically handled by humans.

In summary, automation is the overarching term that best captures the essence of machines taking over tasks usually performed by people, making it the most accurate choice in this context.