Which of the following statements is incorrect regarding some unobtrusive measures? a. the wear and tear of equipment in a factory offers a good indication of depreciation. b. the number of Trash Cans, lins, Jars, Bottles, and Bags found in trash bags provides a good indication of their consumption levels. the Number of readings for each article uploaded in Research@ate provides a good indication of their popularity and frequency of use. d. signatures on Checks exposed to ultraviolet rays provide a good indication of forgery and trauch