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      Question

      A custom stack implementation has a pop() method that is

      supposed to remove and return the top element. However, when the stack is empty, calling pop() causes an error (e.g., IndexError if using a list, or NullPointerException if using a linked list without proper checks). What is the most fundamental debugging step to prevent this underflow error?
      A Ensure the push() method correctly adds elements. Correct Answer Incorrect Answer
      B Implement a peek() method to view the top element without removing it. Correct Answer Incorrect Answer
      C Add a check if not self.is_empty(): before attempting to access or remove an element. Correct Answer Incorrect Answer
      D Increase the initial capacity of the stack. Correct Answer Incorrect Answer
      E Use a try-except block around the pop() operation. Correct Answer Incorrect Answer

      Solution

      The correct answer is C

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