Compressible flow question, hope to get detailed answer

ructure.com/courses/396237/quizzes/803789/take/questions/12526311G. Your combined score in each of the three exams must total 9 points to successfully pass the MS Final Exam.If after two attempts in each exam you do not achieve a combined passing score of 9 points, please visit the MAEGraduate Student Services Team in MAE-A 215, immediately, or call 352-392-0808 for assistance.DQuestion 21 ptsIn order to define the speed of sound as being equal to (VRT) 1/2 which of the following need to betrue?ReversibleAdiabaticO Ideal gasO All of the above