Consider the following statements: 1. Other than those made by humans, nanoparticles do not exist in nature. 2. Nanoparticles of some metallic oxides are used in the manufacture of some cosmetics. 3. Nanoparticles of some commercial products which enter the environment are unsafe for humans. Which of the statements given above is/are correct?

1. Statement 1: Nanoparticles can be produced through various natural processes such as volcanic eruptions, forest fires, weathering, and biological processes. They are not exclusively human-made. Therefore, the statement that they do not exist in nature other than those made by humans is incorrect. 2. Statement 2: Nanoparticles of certain metallic oxides, such as zinc oxide (ZnO) and titanium dioxide (TiO2), are widely used in the manufacture of some cosmetics, particularly sunscreens, due to their UV-blocking properties. This statement is correct. 3. Statement 3: There are growing concerns and ongoing research about the potential environmental and health impacts of engineered nanoparticles released from commercial products into the environment. Due to their small size and unique properties, some nanoparticles may pose risks and are considered potentially unsafe for humans and ecosystems. This statement is correct. 4. Since statements 2 and 3 are correct, the correct option is (D).