What is the output of the following snippet of code? a={} a['a']=1 a['b']=[2,3,4] print(a)

• A. Exception is thrown
• B. {‘b’: [2], ‘a’: 1}
• C. {‘b’: [2], ‘a’: [3]}
• D. {‘b’: [2, 3, 4], ‘a’: 1}