When faced with a situation where a team member often disagrees with the project manager and refuses to implement decisions, it is crucial for the project manager to engage in conflict resolution by understanding the team member's perspective. This involves identifying the root causes of the disagreement and working collaboratively to find a solution that aligns with the project's goals while addressing the team member's concerns. This approach not only resolves the current conflict but also strengthens team cohesion and prevents future disagreements.
References:
PMBOK Guide - Seventh Edition1.
PMI Professional in Business Analysis (PMI-PBA) Reference Materials2.

According to the PMBOK Guide, backlog grooming (also known as backlog refinement) is the process of reviewing, updating, and prioritizing the product backlog items to ensure that the product backlog is ready for the next sprint1. Backlog grooming is an ongoing activity that involves collaboration between the product owner, the development team, and the project manager (or scrum master). Backlog grooming helps to clarify the requirements, remove ambiguity, identify dependencies, estimate effort, and align the product backlog with the product vision and the customer needs2.
In this question, the project manager is faced with a problem that the product owner has uncovered a number of issues that they would like to be addressed before providing approval for the software built to date. These issues may indicate that the product owner is not satisfied with the quality, functionality, or usability of the software, or that the software does not meet the acceptance criteria or the customer expectations. The project manager should approach this problem by planning to address the issues through backlog grooming and incorporating them into the next sprint. This way, the project manager can ensure that the issues are properly documented, analyzed, and prioritized, and that the development team can work on them in the next iteration. This will also help to maintain the agile principles of delivering value, satisfying the customer, and embracing change3.
The other options are not the best ways to approach this problem. Referring the product owner to the change management plan, then escalating to the steering committee is not appropriate for an agile project, as it implies a rigid and formal process that may not be responsive to the customer feedback and the changing requirements. Referring the product owner to the signed business requirement document and explaining that the current plan cannot facilitate these changes is not helpful, as it may create conflict and dissatisfaction with the product owner, and it may also indicate that the project manager is not following the agile value of responding to change over following a plan3. Telling the product owner the issues will be addressed in the second version of the software is not acceptable, as it may delay the delivery of value, compromise the quality of the product, and lose the trust of the product owner.
: 1: PMBOK Guide, 6th edition, p. 179 2: Backlog Grooming: How to Do It and Why It Matters, ProjectManager.com, July 2020, 1 3: Manifesto for Agile Software Development, Agile Alliance, 2001, 2

A hybrid approach in project management is a technique that combines elements from different project management frameworks, such as waterfall and agile, to tailor the methodology to best suit the project at hand12. By merging various methods, organizations can capitalize on the strengths of each approach while mitigating their weaknesses3. A hybrid approach allows for a more detailed and nuanced approach to the work, and requires the project manager to facilitate the collaboration and communication among the team members45. Therefore, the best option for the project manager in this scenario is to facilitate the discussion so that the team members can reach a consensus on the comparative size of the backlog items and if they would fit into the next sprint. This way, the project manager can ensure that the team is aligned on the approach, the customer needs are met, and the project goals are achieved.

The project manager's role is to ensure that the project meets its objectives while balancing the project constraints. In this scenario, the project team has identified a low-cost software product that could drastically reduce the scope of development. The development manager has confirmed that this tool would fulfill the business need. Therefore, the project manager should recommend this option to the product owner for consideration. The product owner is responsible for maximizing the value of the product resulting from the work of the development team. They are the ones who manage the product backlog and make the final decision on what should be included in it. References: Project Management Professional (PMP) Reference Materials, Professional in Business Analysis Reference Materials study guide.

The project manager should review the operations manager's concerns and ensure these concerns are addressed, as this is part of managing stakeholder engagement. Stakeholder engagement involves communicating and working with stakeholders to meet their needs and expectations, address issues, and foster appropriate stakeholder involvement. By reviewing and addressing the concerns, the project manager can increase the stakeholder satisfaction and support for the project, as well as avoid potential conflicts and delays. The other options are not the best ways to handle this situation, as they either ignore, escalate, or document the concerns without resolving them. References: (Professional in Business Analysis Reference Materials source and documents) PMBOK Guide, 6th edition, Chapter 13, Section 13.3 PMP Exam Content Outline, June 2019, Domain II, Task 9 PMP Sample Test Questions, Question 163