Select the correct passive form of the given sentence.
Authorities have stepped up efforts to control the invasion of locusts in Rajasthan and Gujarat.

Efforts to control the invasion of locusts in Rajasthan and Gujarat are being stepped up by the authorities.

Efforts to control the invasion of locusts in Rajasthan and Gujarat were stepped up by the authorities.

Efforts to control the invasion of locusts in Rajasthan and Gujarat were being stepped up by the authorities.

Efforts to control the invasion of locusts in Rajasthan and Gujarat have been stepped up by the authorities.