A sentence has been given in Active/Passive voice. Out of the four alternatives suggested, select the one which best expresses the same sentence in Passive/Active voice.
Navin M Raheja has made several contributions in the field of conservation
1
Navin M Raheja is making several contributions in the field of conservation.
2
Several contributions in the field of conservation are being made by Navin M Raheja.
3
Several contributions in the field of conservation have been made by Navin M Raheja
4
Several contributions in the field of conservation were made by Navin M Raheja