Q. What does the isNaN() function do? (A) Checks if a value is NaN (B) Converts a string to a number (C) Checks if a value is null (D) Checks if a value is undefined 👁️ Show Answer 💬 Discuss 🔗 Share ⚡Menu ✅ Correct Answer: (A) Checks if a value is NaN Explanation: isNaN() checks whether a value is NaN (Not a Number).