Which tasks should a project manager accomplish in order to manage project scope correctly?

Which tasks should a project manager accomplish in order to manage project scope correctly?
A. Define, Validate, and Control Scope; Control Schedule; Control Costs and Manage Stakeholder Engagement.
B. Collect Requirements, Define Scope, Create WBS, Develop Schedule, and Manage Stakeholder Engagement.
C. Plan Scope Management; Collect Requirements; Define, Validate, and Control Scope; and Create WBS.
D. Define, Validate, and Control Scope; Control Costs; Manage Stakeholder Engagement; and keep budget under control.

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