The part of the switcher that creates a key effect after the switcher has created all of the other video effects is called the:

The __________ in Paris has no fixed interior walls and its ducts, pipes, and elevators are color-coded and on the outside of the building

Fill in the blank(s) with the appropriate word(s).

Architects from which city are credited with the development of the skyscraper?

A. New York B. Chicago C. Paris D. St. Louis