D Durgesh 🎓 Tutor III ⭐ 8.64K Points 📊 Python Q. Which of the following is an invalid variable? (A) foo (B) 1st_string (C) my_string_1 (D) _ 👁️ Show Answer 💬 Discuss 🔗 Share ⚡Menu ✅ Correct Answer: (B) 1st_string