What is thinking?

Which answer is the correct definition of "invertible counterpoint"? a. When one contrapuntal line is the inversion of another heard at the sametime

b. When a passage of counterpoint is repeated, but in inversion. c. When the vertical position of two or more voices can be switched withoutviolating the rules of counterpoint or creating undue dissonance. d. All of these choices.

How is scale defined?

A. Repetition of objects in a work B. Size relation of parts to the whole C. Color's relation to value D. Size in relation to a standard or "normal" size