Page 1253 - AP Computer Science A, 7th edition
P. 1253
32. (A) The is-a relationship must work from right-to-left: a Parrot is-a Bird, a Parakeet is-a Bird, and an Owl is-a Bird. All are correct. This relationship fails in declarations II and III: a Parrot is not necessarily a Parakeet, a Bird is not necessarily an Owl, and a Bird is not necessarily a Parakeet.
