During which process does the project team receive bids and proposals?

You are in the process of estimating the type and quality of resources needed to complete individual schedule activities. All of the following are outputs of this process EXCEPT:

When items to be purchased for a project are specified by performance characteristics:

At the end of a project's initiation phase, the budget was developed and sent to the approval board. During the approval meeting, one of the key stakeholders asked how the budget was developed for future uncertainties.
How should the project manager reply?

A project manager leads a development project for a mobile chatting application. One of the experienced developers constantly creates conflicts with the other team members. As a result, the other team members are refusing to work with the developer.
Since the developer is a high
performer, the project goals may be negatively impacted if they leave the team.
What should the project manager do in this situation?