You are the project manager for a large$-$scale software development project. The project is halfway through its timeline, and you have just received a request from a major stakeholder to add a significant new feature that was not included in the original project scope. This new feature is expected to enhance the product's marketability but will require additional resources and time. The project is already operating at maximum capacity, and the budget is tightly constrained. The stakeholder insists that this feature is critical for the product's success and must be included.

How would you approach this situation to make an informed decision, considering the constraints of time, cost, and resources, while ensuring stakeholder satisfaction and project success?

Limit your analysis particularly by providing answer or input over the following:

a$.$ Risk Assessment

b$.$ Resource Allocation:

c$.$ Timelines