Which of the following aims to restrict certain dangerous substances commonly used in electronics and electronic equipment?

The Restriction of Hazardous Substances (RoHS) directive is a European Union initiative that restricts the use of six hazardous materials in the manufacture of various types of electronic and electrical equipment, promoting environmental protection and human health.

IEEE (Institute of Electrical and Electronics Engineers) develops standards for electrical, electronics, and computing technologies, but not specifically for restricting hazardous substances in products.

IETF (Internet Engineering Task Force) develops and promotes voluntary Internet standards, primarily related to internet protocols and architecture.

W3C (World Wide Web Consortium) develops international standards for the World Wide Web, such as HTML and CSS, not for material restrictions in electronics.