challenge: What type of trains have been used to operate Maizuru services since the 12 March 2011 timetable revision?
  
  A. Single-car electric multiple unit trains
  B. 3-car 287 series electric multiple unit trains or 2-car Kitakinki Tango Railway KTR8000 series diesel multiple units
  C. 5-car electric multiple unit trains
  D. 4-car diesel multiple unit trains
  Answer: 