Select the correct passive form of the given sentence.
MCD officials demolished 80 buildings in order to remove the illegal structure.
1
80 buildings were being demolished by MCD officials in order to remove illegal structure.
2
80 buildings were demolished by MCD officials in order to remove illegal structure.
3
In order to remove illegal structure, 80 buildings demolished by MCD officials.
4
In order to remove illegal structure, 80 buildings had been demolished by MCD officials.