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.
The informant of the CBI had seen him leaving the house.
1
Leaving the house he was seen by the informant of the CBI.
2
He has been seen leaving the house by the informant of the CBI.
3
He was seen leaving the house by the informant of the CBI.
4
He had been seen leaving the house by the informant of the CBI.