A project sponsor would like to include a new deliverable. The sponsor contacts the project manager in order to seek advice on the most efficient approach to complete the deliverable within the next $2$ months.What should the project manager do$?$A$.$ Suggest that the sponsor conduct a cost$-$benefit analysis to determine feasibility.B$.$ Advise the sponsor that it is not the project manager's job to evaluate the project.C$.$ Use the management reserve in order to expedite completion of the deliverable within $2$ months.D$.$ Change the project methodology in order to achieve completion of the deliverable within $2$ months.

Which answer is correct?