Ballet companies dance only music especially created for ballets

Which of the following is an example of formalized, generic stage space?

a. a box set b. the Japanese Noh stage with its painted pine tree c. proscenium theatre d. wing and drop scenery

When music videos posted on the _____ medium could be watched by large audiences via an on- demand basis, then viewing was no longer dictated by broadcast and cable TV channels with their fixed schedules.

What will be an ideal response?