Identify the following cadences as perfect or imperfect authentic.

Ancient Romans developed the system of patronage, in which:

a) a code of ethics governed the way the poor were treated. b) citizens were divided into four classes and given the right to vote. c) large estates of the nobility were redistributed to landless farmers. d) plebeians were supported and protected by the patricians.

The ritornello sections in the finale of Bach's Brandenburg Concerto no. 2 can be recognized by their

a. focus on the full orchestra. b. focus on solo trumpet. c. focus on oboe. d. key area.