Which of the following modifications to the list of assets and liabilities below would result in a positive net worth?Home owned $105,000.Mortgage owed $100,000.Car valued at $26,000.Car loan of $22,000.Investment fund of $4,500.Savings of $1,500.Credit card balance of $15,000.a.Lowering mortgage by $1,000.b.Increasing investment fund by $500.c.Adding $100 to savings.d.All of the above.