Which of the following statements is true with regard to the credit for certain retirement plan contributions, the "Savers Credit"? The credit is nonrefundable. The credit is based on eligible contributions not to exceed $2,000 to certain qualified retirement plans. Taxpayer's AGI determines the percentage (0, 10, 20, or 50) to apply to the eligible contributions. The purpose of the credit is to encourage lower and middle-income taxpayers to contribution to qualified retirement plans. All of the above are true