Which setup should the Admin use to meet these requirements?

The Admin wants to ensure that within one bundle. Products A and B cannot both be added to the quote. During Configuration, the user should be able to freely switch between these options. If a user selects both, the system should only add Product A to the quote rather than product B.

Which setup should the Admin use to meet these requirements?
A . Product Validation Rule where two Error Conditions with Summary Variables test if Product A and B are both selected. If so, a message will display, instructing the user to remove Product B.
B . A Product Selection Rule where two Error conditions with Summary Variables test of Product A and B have both been selected. If so, a Product Action will remove Product B.
C . A Product Selection Rule where the Product Action with the lower Order removes Product A when Product B is chosen, and the Product Action with the higher Order removes Product B when Product A is chosen.
D . A Product Alert Rule where two Error Conditions with Summary Variable test of Product A and B have both been selected. If so, a message will display, instructing the user to remove Product B.

Answer: D