R Ram Avtar Sharma 🎓 Achiever ⭐ 4.50K Points 📊 MySQL Q. Which of the following is an illegal unquoted identifier name? (A) 123_id (B) Null (C) id1 (D) 123 👁️ Show Answer 💬 Discuss 🔗 Share ⚡Menu ✅ Correct Answer: (D) 123 Explanation: This question asks about identifier names in MySQL. An identifier is a name used to refer to things like tables, columns, and databases.