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What is the output of the following Python code?
d = {}
d.setdefault('a', []).append(1)
d.setdefault('a', []).append(2)
d.setdefault('b', []).append(3)
print(d)- A{'a': [1], 'b': [3]}
- B{'a': [2], 'b': [3]}
- C{'a': [1, 2], 'b': [3]}
- D{'a': [1, 2, 3]}
Correct answer: C