Q. To perform file-based I/O operations, you must use the __________.
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(A)
<ifstream>
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(B)
<ofstream>
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(C)
<fstream>
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(D)
None of the above
✅ Correct Answer: (C)
<fstream>
Explanation: To perform processing on C++ files, the header files <iostream> and <fstream> must be included in your C++ source file.