Page 1229 - AP Computer Science A, 7th edition
P. 1229
20. (A) The correct diagram uses two up arrows to show that a Car i s -a Vehicle and a Truck i s -a Vehicle (inherit anc e relationship). The two down arrows indicate that a Car has-a AirBag and a Truck has-a AirBag (composition relationship). In each of the incorrect choices, at least one of the relationships does not make sense. For example, in choice B a Vehicle has- a Truck, and in choice E an AirBag is-a Car.
