V Vinay 🎓 Mover ⭐ 28.75K Points 📊 Enterprise Systems Q. Legacy systems: (A) often require expensive maintenance. (B) may be difficult to integrate with new systems. (C) use a collection of independent files or databases. (D) All of the above. 👁️ Show Answer 💬 Discuss 🔗 Share ⚡Menu ✅ Correct Answer: (D) All of the above.