R Ranjeet 🎓 Tutor III ⭐ 34.60K Points 📊 C++ Q. Which of the following is not a valid C++ identifier? (A) _variable (B) 123variable (C) variable_123 (D) VariableName 👁️ Show Answer 💬 Discuss 🔗 Share ⚡Menu ✅ Correct Answer: (B) 123variable Explanation: In C++, an identifier cannot start with a digit.