The project manager should use a collaborative or problem-solving strategy to resolve this conflict in the meeting. This strategy involves finding a solution that fully satisfies the concerns of both parties and results in a win-win outcome. The project manager should ensure that both managers understand the requirements and the impact of their contradiction on the project scope, quality, and schedule. The project manager should also facilitate a constructive dialogue between the managers and help them identify and evaluate alternative solutions that can meet the project objectives and satisfy the stakeholders. The project manager should avoid imposing a decision or favoring one side over the other, as this may lead to resentment, resistance, or further conflict.
Option A is not a good choice, because it does not address the root cause of the conflict or seek a resolution. It may also create confusion, ambiguity, or inconsistency in the project deliverable, as well as increase the project risk and complexity.
Option B is not a good choice, because it does not involve the managers in finding a solution or consider their interests and needs. It may also create dissatisfaction, frustration, or hostility among the managers, as well as affect the project quality and stakeholder satisfaction.
Option D is not a good choice, because it does not foster a cooperative or integrative approach to resolving the conflict. It may also create a competitive or adversarial atmosphere in the meeting, as well as ignore the non- monetary or intangible factors that may influence the managers' preferences and expectations.
: 1: Project Management Professional (PMP) Certification 2: A Guide to the Project Management Body of Knowledge (PMBOK Guide) - Seventh Edition

C 4 4
Explanation:
One of the methods to prioritize projects or features is to use a scoring model, which evaluates different aspects of a project or feature and assigns a numeric value to each criterion. In this case, the criteria are the business value and the development effort of each feature. A common way to calculate the score of a feature is to divide the business value by the development effort, which gives the value-to-effort ratio. The higher the ratio, the higher the priority of the feature. Using this method, the scores of the features are:
Feature A: 100 / 20 = 5
Feature B: 80 / 10 = 8
Feature C: 120 / 15 = 8
Feature D: 60 / 5 = 12
Feature E: 40 / 10 = 4
As you can see, Feature D has the highest score, but it also has the lowest business value. Therefore, it may not be the best choice to prioritize first, as it may not align with the strategic goals of the product or the organization. Feature C, on the other hand, has the same score as Feature B, but it has the highest business value among all the features. Therefore, Feature C should be the first feature to prioritize, as it delivers the most value with a reasonable effort.
References:
Project Prioritization Process: 5 Strategies to Prioritize Your Projects
5 Steps to Master Requirements Prioritization

According to the PMBOKGuide, effective communication is crucial for project success. The project manager should ensure timely and appropriate generation, collection, dissemination, storage, and ultimate disposition of project information. This includes direct communication with stakeholders about any changes or delays in the project schedule. By communicating directly, the project manager can manage stakeholders' expectations and maintain trust12. References: = Project Communications Management According to the PMBOK1; Project communication-foundation for project success2.

When a scheduled event affecting project timelines is delayed, it is crucial for the project manager to communicate this change to all relevant stakeholders. This ensures that everyone is aware of the delay and can adjust their schedules and expectations accordingly. The PMP outlines the importance of clear communication with stakeholders as part of project integration management and stakeholder engagement (PMBOKGuide).
References:
* Project Management Institute. (2021). A Guide to the Project Management Body of Knowledge (PMBOKGuide) - Seventh Edition. Project Management Institute.
* Project Management Institute. (2019). PMP Examination Content Outline. Project Management Institute.

According to the PMBOK Guide, the project manager is responsible for leading and directing the project team and ensuring that the project objectives are met. Therefore, the project manager should not delegate the decision-making authority to the team or the sponsor without analyzing the impacts and creating a plan for team decision making. The project manager should also consider the risks, issues, and stakeholder expectations that may arise during their absence and communicate the plan to the relevant parties. Postponing the vacation to a different time may not be feasible or desirable for the project manager, and it may also affect their work-life balance. Allowing the team to make decisions to stay on schedule may result in scope creep, quality issues, or conflicts among team members. Asking the project sponsor to make any necessary decisions may undermine the project manager's authority and credibility, and it may also burden the sponsor with additional work. References: PMBOK Guide, Sixth Edition, Chapter 9, Section 9.4.2.3 (Team Decision Making) and Chapter 13, Section 13.3.2.4 (Project Manager)