This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
It isn't possible to only select one if two are required. You must choose two to finish the test. As Bill said there is no partial credit. You must get both correct in order to get credit for the question.