Which of the following statements about the U.S. federal debt is NOT true? a. On a per-capita basis, the ratio of U.S. federal debt to GDP was at an all-time high in 2020 standing at almost 130%. b. The U.S. federal debt is, about $29 trillion dollars, or almost $100,000 per person living in the United States. c. The debt is the sum of all budget deficits and budget surpluses over time. d. The debt equals government spending less taxes collected over the last year. e. About 30% of U.S. government debt is held by foreign individuals and firms