Which of the Following Statements Is Correct

Which of the following statements is correct?

A) Contributions to Keogh plans by self-employed taxpayers are generally limited to the lesser of 15 percent of their net earned income before the Keogh deduction) or $45,000.
B) The contribution limits for SEPs Simplified Employee Pension) are the lesser of 20 percent of net self-employment income or $51,000 for a self-employed taxpayer.
C) Employees may elect to make annual contributions to 401k) plans up to the lesser of 15 percent of their net earned income before the 401k) deduction) or $45,000.
D) The contribution limits for SEPs are a maximum of $17,500 $23,000 for taxpayers 50 or older) .