Which of the following would not be an alternate way to write remove() method?

public T remove()
{
  T result = removeEntry(getIndexOf(null));
  return result;
} 

• public T remove()
  {
    return removeEntry(numberOfEntries-1);
  }

• public T remove()
  {
    T result = null;
    if (numberOfEntries > 0)
    {
      result = contents[numberOfEntries -1];
      contents[numberOfEntries - 1] = null;
      numberOfEntries--;
    }
    return result;
  }

• public T remove()
  {
    T result = removeEntry(numberOfEntries-1);
    return result;
  }