Q. Which of the following is used to make an abstract class? (A) Making at least one member function as pure virtual function. (B) Making at least one member function as virtual function. (C) Declaring it abstract using virtual keyword. (D) Declaring it abstract using static keyword. 👁️ Show Answer 💬 Discuss 🔗 Share ⚡Menu ✅ Correct Answer: (A) Making at least one member function as pure virtual function.