Select the option that expresses the given sentence in passive voice.
The Indian army airlifted thousands of people from Ukraine.
1
Thousands of people had been airlifted from Ukraine by the Indian army.
2
Thousands of people have been airlifted from Ukraine by the Indian army.
3
Thousands of people are airlifted from Ukraine by the Indian army.
4
Thousands of people were airlifted from Ukraine by the Indian army.