Which one is the correct positive degree of: 'He is the strongest boy in the class'?

1. ক
   No other boy in the class is as strong as he.
   
2. খ
   Very few boys in the class are as strong as he.
   
3. গ
   He is not as strong as any other boy.
   
4. ঘ
   No other boy is stronger than he.