What do technology systems refer to? 

The ethical considerations and guidelines for technology use 

The impact of technology on individuals, communities, and society 

The consequences of inappropriate use of technology 

The infrastructure, hardware, and software that enable technological tools 

The risks and negative consequences of excessive technology use 

All of the above. Technology systems refer to the infrastructure, hardware, and software that enable technological tools. They also encompass the ethical considerations and guidelines for technology use, the impact of technology on individuals, communities, and society, and the consequences of inappropriate use or excessive technology use. It includes understanding the risks and negative consequences that can arise from technology use.