M Mr. Dubey 🎓 Coach ⭐ 104.48K Points 📊 JAVA Q. Which of these is NOT a valid functional interface in Java? (A) Runnable (B) Callable (C) Comparator (D) Thread 👁️ Show Answer 💬 Discuss 🔗 Share ⚡Menu ✅ Correct Answer: (D) Thread Explanation: Thread is a class, not a functional interface.