Which one of the following is a component of both the Basal Convention

Which one of the following is a component of both the Basal Convention and the Stockholm Convention?

Mercury
Plastic waste
Persistent organic pollutants
Heavy metals
This question was previously asked in
UPSC CAPF – 2010
The Basel Convention on the Control of Transboundary Movements of Hazardous Wastes and Their Disposal regulates the movement and disposal of hazardous and other wastes. The Stockholm Convention on Persistent Organic Pollutants (POPs) aims to eliminate or restrict the production and use of POPs and reduce their release into the environment. Hazardous wastes covered under the Basel Convention can include wastes containing POPs. The Stockholm Convention also addresses the environmentally sound management and disposal of POPs, which when in waste form, fall under the purview of the Basel Convention for transboundary movement. Therefore, Persistent Organic Pollutants are a component relevant to both conventions, especially in the context of POPs waste.
While Basel deals broadly with hazardous waste and Stockholm deals with specific persistent organic pollutants, the intersection occurs when POPs become waste, making POPs a relevant element to both agreements.
The Basel Convention was adopted in 1989 and entered into force in 1992. The Stockholm Convention was adopted in 2001 and entered into force in 2004. Other options like Mercury are covered by the Minamata Convention, and Plastic waste was recently added to the scope of the Basel Convention but is not the primary focus of the Stockholm Convention.