Choose the correct superlative form of: 'Some students are at least as hardworking as Rahim.'

1. ক
   Rahim is one of the most hardworking students.
   
2. খ
   Rahim is the most hardworking student.
   
3. গ
   Rahim is not the most hardworking student.
   
4. ঘ
   Rahim is more hardworking than some students.