11.2 Let us consider a version of the milk/banana/drill shopping problem in which money is included, at least in a simple way.

a. Let CC denote a credit card that the agent can use to buy any object. Modify the description!

of Buy so that the agent has to have its credit card in order to buy anything.

b. Write a PickUp operator that enables the agent to Have an object if it is portable and at thej same location as the agent.

c. Assume that the credit card is at home, but Have(CC) is initially false. Construct a partially ordered plan that achieves the goal, showing both ordering constraints and causal links.

d. Explain in detail what happens during the planning process when the agent explores a|

partial plan in which it leaves home without the card.