The emergency plan refers to emergency management, command, rescue plan, etc. in the face of emergencies such as natural disasters, major accidents, environmental hazards, and man-made damage. It should generally be based on comprehensive disaster prevention planning. Public incidents refer to emergencies that occur suddenly, cause or may cause significant human death, property damage, damage to the ecological environment and serious social hazards, and endanger public safety. Based on the above definitions, Which of the following successfully applied emergency plans are:. ['After the torrential flash flood erupted, City A immediately formulated a rescue plan to rescue the trapped people.', 'Typhoon in Province B. Due to the accurate forecast of the meteorological department, the people prepared for protection in advance, and the overall loss was small.', 'Sudden hostage hijacking in a kindergarten in C City, more than 50 teachers and children were trapped, rescue workers were in distress, and the crisis was successfully resolved with the collective wisdom.', 'The accident of leakage of toxic chemicals in a large chemical factory suddenly occurred in Ding City, and the government immediately conducted public rescue and rescue in accordance with the planned plan.']