Select the correct active form of the given sentence.
Mobile toilets were placed by the district administration behind the area where people assembled for army recruitment.

The district administration has placed mobile toilets behind the area where people assembled for army recruitment.

The district administration is planning to place mobile toilets behind the area where people will assemble for army recruitment.

The district administration placed mobile toilets behind the area where people assembled for army recruitment.

The mobile toilets placed district administration behind the area where people assembled for army recruitment.