D Durgesh 🎓 Tutor III ⭐ 8.64K Points 📊 Computer Q. Primary rate for ISDN system is (A) 1A + 1C (B) 2B + 1D (C) 23B + 1D (D) 4B + 3C 👁️ Show Answer 🔗 Share ⚡Menu ✅ Correct Answer: (B) 2B + 1D You must be Logged in to update hint/solution 💬 Discussion 💬 Comment