Grammar/Mechanics Checkup 8: Commas 3

The following questions will test your knowledge of comma usage.

Identify the comma error(s), and choose the best revision.

Sarah Cortez MBA, is the lead author of the best-selling book, Thought before Action.
Sarah Cortez, MBA, is the lead author of the best-selling book, Thought before Action.
Sarah Cortez, MBA is the lead author of the best-selling book, Thought before Action.
Sarah Cortez MBA is the lead author of the best-selling book, Thought before Action.