The RACI matrix is a tool that clarifies the roles and responsibilities of individuals or groups in a project's successful completion. It helps to define who is Responsible, Accountable, Consulted, and Informed for each task or deliverable. This is particularly useful in addressing governance issues like the one described, where a team member is receiving conflicting assignments. By establishing a RACI matrix, the project manager can ensure that everyone knows who is responsible for what, thus preventing confusion and inefficiency.
Reference:
"RACI Matrix: Responsibility Assignment Matrix Guide for 2024" from project-management.com1.
"Project Governance Critical Success" from PMI2.
"Exam PMP topic 1 question 338 discussion" from ExamTopics3.
"PMP Exam Tip: The Responsibility Assignment Matrix (RAM)" from project-management-prepcast.com4.

In the context of project management, when a team member encounters an issue such as a non-working computer, it is essential for the project manager to take a proactive approach to resolve the issue promptly. This is to ensure that the project work is not delayed and the team member can continue contributing to the project. According to the PMBOK guide, the project manager should facilitate problem-solving and provide support to team members to address and resolve issues that can impact project progress1.
Reference:
PMBOK Guide - Seventh Edition1
PMP Examination Content Outline - June 20192
Professional in Business Analysis Reference Materials3

Tailoring project artifacts is a critical process in project management, particularly when dealing with unique projects that differ from an organization's usual operations. The PMBOK Guide emphasizes that artifacts should be tailored according to the nature and characteristics of the project, taking into account the applicable development approach, whether it's predictive, Agile, or hybrid1234. This tailoring process involves the project manager and the project management team selecting the appropriate artifacts that best support the project's delivery approach, deliverables, and organizational environment4. It is their responsibility to determine which artifacts are necessary and relevant for the specific project at hand, ensuring that the project's documentation aligns with its unique requirements and goals1234.
Reference:
PM Study Circle: "A Guide to Project Management Artifacts: PMP Exam 2024 Tips" 1 PM Study Circle: "What are Project Artifacts? Definition, Meaning, and Example" 2 Hatchett Project: "What is Project Tailoring?" 3 Project Management Academy: "Project Management Artifacts: Definition, Types, and Phases" 4

Since the requested change implies a complete shift in direction and scope, the business case must be updated to reflect the new strategic goals. The business case justifies the project's existence, and updating it ensures all stakeholders are aligned before initiating a new scope or restarting the project.
Option A is reactive and premature without business justification.
Option B is tactical and may follow later.
Option C bypasses critical governance and approval processes.
Reference:
PMBOK Guide - Seventh Edition, Value Delivery and Governance Domains
PMBOK Guide - Sixth Edition, Section 1.2.5: Business Case Review
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The PMBOK Guide suggests that when a project team recognizes an underestimation of work complexity, it is essential for the project manager to engage with the team to review and adjust the project's approach. This includes reassessing the iteration's work and complexity, updating the project management plan as necessary, and ensuring that the team has a clear understanding of the revised objectives and tasks12. Reference"Protecting software development projects against underestimation" from PMI1; "Practice: Iteration Planning Meeting" from PMI2.