以下程序的运行结果是？（ ）
a={"name":"jt","age":29,"class":5} a["age"]=15 a["school"]="派森社" print("age:",a["age"]) print("school:",a["school"])
age: 29 school: 派森社
age: 15
age: 15 school: 派森社
school: 派森社