The project team should utilize rolling wave planning, which would allow the project team to revisit the deliverables that need to be decomposed as more information becomes available. 1 is incorrect because this answer does not fully satisfy the question. 2 is incorrect. It may be useful to use the WBS of past projects, but this answer assumes that the past projects are similar. In addition, the question states that some of the deliverables cannot be decomposed until later in the project duration. 4 is incorrect because this is not a true statement.