Select the option that expresses the given sentence in passive voice.
They were preparing banners with different designs for the sports meet.
1
Banners were being prepared by them with different designs for the sports meet.
2
Banners have prepared by them with different designs for the sports meet.
3
Banners had been prepared by them with different designs for the sports meet.
4
Banners were prepared by them with different designs for the sports meet.