Which of the Following Is a True Statement Regarding Saving

Which of the following is a True statement regarding saving for retirement?

A) In a given year, a taxpayer may participate in either an employer-sponsored defined benefit plan or defined contribution plan but not both.
B) In a given year, a taxpayer who receives salary as an employee and also receives self-employment income may participate in an employer-sponsored defined contribution plan or may contribute to a self-employed retirement account but not both.
C) In a given year, a taxpayer may contribute to an IRA (either traditional or Roth) or contribute to a self-employment retirement account but not both.
D) None of the choices is a True statement.