Select the option that expresses the given sentence in passive voice. The invigilator is advising the students not to carry calculators into the examination hall.

The students were advised not to carry calculators into the examination hall. The students are being advised by the invigilator not to carry calculators into the examination hall. The students have been advised not to carry calculators into the examination hall by the invigilator. The students were advised the invigilator not to carry calculators into the examination hall.

The students are being advised by the invigilator not to carry calculators into the examination hall.