Which of the following taxpayers may potentially qualify for the Retirement Savings Contributions Credit (Saver's Credit)? (Assume that all are over the age of 18, not claimed as a dependent on another's return, and not a student.)

John and Angie are married and file a joint return. Their modified adjusted gross income is $52,762. Angie contributed to a Roth IRA.

LaMonte will use the single filing status. His modified adjusted gross income is $47,000. His employer made contributions on his behalf to a simplified employee pension (SEP) IRA.

Maureen will use the head of household filing status. Her modified adjusted gross income is $55,000. She contributed to a traditional IRA.

Vicky and Edmond are a married couple filing a joint return. Their modified adjusted gross income is $72,000. Vicky made voluntary contributions to her company's 401(k) plan.