The correct answer is D.
In a procurement situation, generally only the procurement manager has the authority to sign changes. Sometimes the project manager has certain expanded authority to sign in the event of an emergency. However, an increase in cost is generally not considered an emergency. Choice A is not appropriate, since in this case, a procurement manager must sign a change. Reporting (choice B) will take too long, and should not be necessary. An extension (choice C) will not help in this situation.
Pass PMP in the First Attempt : PMP Strategy
Revise Procurement Management Concepts: Project Procurement Management
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