已知字典dict1={0:"zero",1:"one",2:"two",3:"Three"}，执行语句dict1[3]="three"后，字典dict1的内容是什么？

{0:"zero",1:"one",2:"two",3:"Three"}

{0:"zero",1:"one",2:"two",3:"three"}

{0:"zero",1:"one",2:"two","3":three}

{0:"zero",1:"one",2:"two",3:"Three",3:"three"}