Please help with the following questions and provide explanations for each.

Which of the following is true regarding the percentage of completion method for accounting for long-term construction contracts? (O a) The revenue to be reported in each year is the total revenue to date minus the previous year's revenue to date (C) b) To calculate the percentage of the project complete each reporting period, divide the costs incurred to date by the total gross profit C) c) None of the choices (C) d) All of the choices (O e) To record progress billings, a contract asset must be set up