Which of the following is an example of frictional unemployment? Select one: O A. Dave searches for a new job after voluntarily moving to San Diego. O B. Bill is qualified and would like to be an airline pilot, but airlines do not find it profitable to hire him at the wage established by the airline pilots' union. O C. Joan is willing to work for less than the going wage, but there are no jobs available. O D. Elaine is willing to work for less than the minimum wage, but employers cannot hire her for less than the minimum wage