The schedule baseline is a required component of the project management plan. Project management plan is a formal, agreed document that defines how the project is executed, monitored and controlled. It may be summary or detailed and may be composed of one or more subsidiary management plans and other planning documents. The objective of a project management plan is to define the approach to be used by the project team to deliver the intended project management scope of the project. The project manager creates the project management plan with the inputs from the project team and key stakeholders. The plan should be agreed and approved by at least the project team and its key stakeholders.

Answer option C is incorrect. The schedule baseline is not a project objective.

Answer option A is incorrect. The project calendar defines when the project will take place.

Answer option B is incorrect. Project constraints are restrictions imposed on the project, such as time, cost, and scope.