In the following question, a sentence has been given in Active/Passive Voice. Out of the four alternatives suggested, select the one which best expresses the same sentence in Passive/Active Voice.
Grid failure brings five hundred trains to a halt.
1
Five hundred trains are being brought to a halt by grid failure.
2
Five hundred trains are brought to a halt by grid failure.
3
Five hundred trains were brought to a halt by grid failure.
4
Five hundred trains had been brought to a halt by grid failure.