Change into superlative degree: 'No other boy in the class is as tall as Rahim.'

1. ক
   Rahim is taller than any other boy.
   
2. খ
   Rahim is the tallest boy in the class.
   
3. গ
   Rahim is one of the tallest boys.
   
4. ঘ
   Rahim is as tall as any other boy.