Consider the following statements regarding nanoparticles:

1. Nanoparticles are exclusively man-made and do not occur naturally in the environment.

2. Metallic-oxide nanoparticles are used as active ingredients in certain cosmetic products such as sunscreens.

3. Nanoparticles present in some commercial products can pose safety concerns when they enter the environment.

How many of the statements given above are correct?