Which of the following is NOT a type of solid waste?

The correct choice is that digital is not a type of solid waste. Solid waste typically refers to unwanted or discarded materials that are tangible and have physical substance, which can be categorized into various types such as agricultural, commercial, and industrial waste.

Agricultural waste includes materials like crop residues and animal manure that arise from farming activities. Commercial waste comes from businesses and includes packaging materials, office waste, and similar items. Industrial waste consists of materials produced from manufacturing processes, such as scrap metal and chemicals.

Digital waste, on the other hand, refers to obsolete or unused electronic devices and does not pertain to solid waste in the traditional sense because it reflects data rather than physical materials. While digital waste can include e-waste, which is a physical form of discarded electronics, the broad category of 'digital' itself does not align with the definition of solid waste, as it suggests immaterial substances. Hence, this distinction clarifies why digital is the choice that does not represent a type of solid waste.