Using the Abbreviations Listed Below, Indicate for Each of the Costs

Using the abbreviations listed below, indicate for each of the costs whether the cost should be classified as: $\begin{array} { l l l } \mathrm { P } & = & \text { Prevention } \\\mathrm { D } & = & \text { Detection } \\\mathrm { I } & = & \text { Internal Failure } \\\mathrm { E } & = & \text { External Failure } \\\mathrm { N } & = & \text { none of the above }\end{array}$
1. Inspecting products and processes
2. Verifying supplier environmental performance
3. Testing for contamination
4. Obtaining ISO 14001 certification
5. Carrying out environmental studies
6. Operating pollution control equipment
7. Cleaning up a polluted lake
8. Recycling scrap
9. Recycling products
10. Cleaning up oil spills