Which of the following statements about copyrights is true? (1)A thesis advisor at a graduate institute may compile their students' work and publish it as a monograph. (2)In principle, recording or videotaping a live performance of art is against copyright law. (3)A work can be freely modified after the death of its author as it is no longer protected by copyright law. (4)The copyright for student essays written under the guidance of a professor during school hours belongs to the school