A change that adds to the project scope will likely cause the WBS and the WBS dictionary to be updated. The scope baseline is the combination of the project scope statement, the WBS, and the WBS dictionary so all three are updated and linked together. 2 is incorrect. The project charter does not need to change. 3 is incorrect. In some instances, the communications matrix will need to be updated—but not in all instances. That’s why 1 is a better answer to this question. 4 is incorrect. In some instances, the contractual agreements will need to be updated—but not in all instances. Again, that’s why 1 is a better answer to this question. For instance, not every project will have a contract.