According to the PMBOK® Guide (Project Management Body of Knowledge), specifically within the Project Cost Management knowledge area:

Determine Budget (Option D): This is the process of aggregating the estimated costs of individual activities or work packages to establish an authorized cost baseline. The two primary outputs of this process are the Cost Baseline (the approved version of the time-phased project budget, excluding any management reserves) and the Project Funding Requirements (total funding and periodic funding requirements, which include the cost baseline plus management reserves).

Estimate Costs (Option A): This process involves developing an approximation of the monetary resources needed to complete project work. Its primary outputs are Activity Cost Estimates and Basis of Estimates. It does not produce the baseline itself.

Control Costs (Option B): This is the process of monitoring the status of the project to update the project costs and managing changes to the cost baseline. Its outputs include Work Performance Information, Cost Forecasts, and Change Requests.

Plan Cost Management (Option C): This is the initial process that defines how the project costs will be estimated, budgeted, managed, monitored, and controlled. Its sole output is the Cost Management Plan.

In the PMI framework, the Cost Baseline is used as a basis for comparison to actual results. The Project Funding Requirements are often derived from the cost baseline but may include " step-increases " or management reserves to ensure the organization has sufficient cash flow to support project expenditures at various milestones.