Choose the correct indirect speech of: He said, 'I have to finish this work today.'

1. ক
   He said that he has to finish that work that day.
   
2. খ
   He said that he had to finish that work that day.
   
3. গ
   He said that he would have to finish this work today.
   
4. ঘ
   He said that he had had to finish that work that day.