Q. How can we make a class abstract? (A) By making all member functions constant. (B) By making at least one member function as pure virtual function. (C) By declaring it abstract using the static keyword. (D) By declaring it abstract using the virtual keyword. 👁️ Show Answer 💬 Discuss 🔗 Share ⚡Menu ✅ Correct Answer: (B) By making at least one member function as pure virtual function.