以下代码输出结果是?( )
ls =["2021","123","Python"]ls.append([2021,"2021"])ls.append(2021)print(ls)
['2021', '123', 'Python', 2021]
['2020', '123', 'Python', [2021, '2021']]
['2021', '123', 'Python', [2021, '2021'], 2021]
['2020', '123', 'Python', [2021],2021]
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