R Ram Sharma 🎓 Coach ⭐ 193.88K Points 📊 C++ Q. To perfor file input / output operation in C++, we must include which header file ? (A) <fiostream> (B) <ifstream> (C) <ofstream> (D) <fstream> 👁️ Show Answer 💬 Discuss 🔗 Share ⚡Menu ✅ Correct Answer: (D) <fstream>