Combine the following simple sentences into one sentence:
The question paper was leaked before the commencement of the examination. Students are demanding re-examination.
1
The question paper being leaked before the commencement of the examination, students are demanding re-examination.
2
The question paper having been leaked before the commencement of the examination, students are demanding re-examination.
3
The question paper having leaked before the commencement of the examination, students are demanding re-examination.
4
None of these