What independent changes will allow the code to work correctly?
class Counter {
  public: // 1
    void Count(); // 2

int main() {
  Counter obj;
  return 0;

// 3
Let's consider all options one by one:
  • code couldn't compile without changes: obj.Count() calls function that doesn't have definition
  • changing private to public in line 1 wouldn't solve problems described above, but also we can't call private member of class
  • add code in line 3 also wouldn't solve first problem, class method still doesn't have definition

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