According to the PMBOK Guide, one of the tools and techniques for performing integrated change control is risk analysis1. This involves assessing the potential impact of a change request or a defect on the project objectives, such as scope, schedule, cost, and quality. By performing risk analysis, the project manager can evaluate the pros and cons of deploying the system with the defect, and determine the best course of action.
The other options are not appropriate, as they do not address the issue of whether to deploy the system or not.
Proposing a solution redesign, revising the quality control measurements, and developing a mitigation plan are all possible actions that could be taken after performing risk analysis, depending on the results. References:
* 1: PMBOK Guide, 6th edition, page 120

In an agile approach, features and tasks are prioritized based on business value, which is a core principle of agile methodologies1. The project manager should explain to the CFO that the agile prioritization process aims to deliver the highest business value in the shortest time. This means that features are implemented not based on their order of submission but based on the value they add to the business and the customers2. It's important to communicate that while the feature for the financial department is essential, it will be delivered at the right time in the project lifecycle to maximize value and ensure proper implementation.
References:
* Agile Methodology in Project Management as a Licensed PMP1.
* Agile Prioritization Techniques You Must know in 20232.

According to the PMBOK guide, one of the principles of agile project management is to empower the team to self-organize and make decisions about how to best accomplish their work. Self-organizing teams are more likely to be motivated, creative, and productive, as they have a sense of ownership and autonomy over their work. Self-organizing teams also have the ability to inspect and adapt their processes and practices based on feedback and learning. Therefore, when a team faces recurring issues, the project lead should not intervene or impose solutions, but rather facilitate the team's reflection and improvement. The project lead can use techniques such as retrospectives, which are meetings where the team reviews their performance and identifies what went well, what did not go well, and what actions they can take to improve. The project lead can also help the team to update their team working agreement, which is a document that defines the team's norms, values, and expectations. A team working agreement can help the team to align on their goals, roles, responsibilities, and communication methods, as well as to resolve conflicts and issues. The project lead should not notify senior management, challenge the team, or post the agreements, as these actions may undermine the team's trust, autonomy, and accountability. References:
* PMBOK guide, page 18, section 1.2.3, Agile Considerations in Project Management
* PMBOK guide, page 437, section 11.2.2.3, Meetings
* Creating a Team Working Agreement

Explanation: