A company wants to launch a new product for customers. The project for this new product is in the development phase. Due to an uncertain environment, the project manager has doubts about the feasibility of the project. What should the project manager do in this situation? Refer to the lessons learned to determine the impact on the external environment. Highlight the concern to the project sponsor in the next project review meeting. Recommend postponing the project until the uncertainty is resolved. Validate assumptions using appropriate tools to assess the risks