Which of the following statements is false regarding Amazon's PP&E (including financing leases) for the year 2020? Assume the book value of land is immaterial.

a. 38.2% of Amazon's PP&E has been depreciated/amortized by the end of 2020

b. The average are of Amazon's depreciable/amortizable PP&E in 2020 was 3.73 years

c. In 2020, Amazon depreciated/amortized its PP&E over an average of 9.77 years

d. In 2020, Amazon generated on average about $3.17 per dollar invested in (net) PP&E

This question uses Amazon's 10k form from 2020. I can't attach the pdf file. As stated I cant provide the 10k form itself