运行下方代码段，输出的结果是（ ）。
t = {"all":{3,5,6,7,4},"new":{1,2},"old":(5,6)} t.pop("old") t["new"] = {} for i in ["old","new"]: if i in t: print(type(t[i]))
<class 'dict'>
<class 'set'>
<class 'list'>
<class 'tuple'>