Convert this passive voice into active voice.
"The implementation of the new policy was fiercely debated by the members of the committee."
1
The committee members were fiercely debating the implementation of the new policy.
2
The committee members fiercely debated the implementation of the new policy.
3
The committee members have fiercely debated the implementation of the new policy.
4
The committee members are fiercely debating the implementation of the new policy.