A duct smoke detector activates on the 23rd floor of a 60-story building that has three elevator banks (A, B & C) that serve the floors equally and which have four elevators each. Another duct smoke detector activates on 23 rd floor. An area smoke detector activates on the 24th floor. Two passenger elevator lobby smoke detectors activate on the 25th floor. Other area smoke detectors activate in the telephone closet, the electric closet; and inside the elevator machine room nearest to the 23rd floor. A manual pull station is activated. The system is "offline". What is happening? Did any elevators recall? If so, which bank(s) recalled, and what are the numbers of those elevators that recalled? Explain your answers.