D Durgesh 🎓 Tutor III ⭐ 8.64K Points 📊 Python Q. Which of the following is invalid? (A) __str__ = 1 (B) _a = 1 (C) __a = 1 (D) None 👁️ Show Answer 💬 Discuss 🔗 Share ⚡Menu ✅ Correct Answer: (D) None