Q. Which method is used to combine DataFrames with overlapping columns, filling missing values with NaN?
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(A)
merge()
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(B)
concat()
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(C)
join()
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(D)
combine_first()
✅ Correct Answer: (D)
combine_first()
Explanation: combine_first() combines two DataFrames, filling missing values in one DataFrame with values from the other.