During earlier stages of one of the project, sponsor hands you high level requirements and asks you to confirm if the project can be completed within the project budget. What is the BEST method to handle this?
a) Build the estimate in the form of range of possible results.
b) Ask the team members to help estimate the cost based on the high level requirements.
c) Based on the information you have, calculate a parametric estimate.
d) Provide an analogous estimate based on past history