R Roshan 🎓 Extraordinary ⭐ 2.52K Points 📊 JAVA Q. Which collection is synchronized? (A) HashMap (B) ArrayList (C) Hashtable (D) HashSet 👁️ Show Answer 💬 Discuss 🔗 Share ⚡Menu ✅ Correct Answer: (C) Hashtable Explanation: Hashtable is synchronized by default.