You are working as a project manager for a wind-powered vehicle manufacturing project which is in its planning phase. You carefully gathered all your requirements from your key stakeholders and prepared a system requirements specification and project requirements specification. While presenting your specifications to the project team, an enthusiastic project team member started talking about the duration estimates for each activity. Which of the following statements indicates your response to your team member?

WBS creation and Schedule development must be done after estimating durations.

Schedule development and Costs estimation must be done before estimating durations.
Scope definition, WBS creation, Quality planning, and Communication planning must be done before estimating durations.
Scope definition, WBS creation, Activity definition, and Activity sequencing must be done before estimating durations.