Simplify the following expressions. Here, b is a variable of type boolean. a. b true b. b false c. b != true d. b != false Simplify the following statements. Here, b is a variable of type boolean and n is a variable of type int. a. if (n 0) { b = true: } else { b = false: } b. if (n 0) { b false: } else { b = true: } c. b = false: if (n > 1) { if (n 2: } What is wrong with the following program? System.out.print("Enter the number of quarters: "): int quarters = in.nextInt(): if (in.hasNextInt()) { total = total+ quarters * 0.25: System.out.println("Total: " + total): } else { System.out.println("Input error."): }