Select the option that expresses the given sentence in passive voice.
The research team is conducting experiments on a new drug that could revolutionise the treatment of the disease.
1
Experiments have been conducted on a new drug that could have revolutionised the treatment of the disease through the research team.
2
Experiments were being conducted on a new drug that could revolutionise the treatment of the disease by the research team.
3
Experiments are conducted on a new drug that could revolutionise the treatment of the disease from the research team.
4
Experiments are being conducted on a new drug that could revolutionise the treatment of the disease by the research team.