In which of the following situations may the taxpayer take an education expense on Schedule C? a. Henry, a self-employed administrative assistant, is taking an advanced Word computer program class through an adult school program. b. Ann Marie is taking a review course in order to pass the certified financial planner examination. c. John, a plumber by trade, is taking classes to qualify as an electrician so he may take on more complex contractor jobs. d. Barbie is flying on numerous commercial airplanes in order to observe the flight attendants so that she may improve her public relations skills.