Identifying the root cause analysis. Identifying the root cause analysis is a quality assurance tool that can help to find and eliminate the underlying causes of quality problems or defects. Root cause analysis is a systematic process of asking why a problem occurred and tracing it back to its source. Root cause analysis can help to prevent recurrence of the same or similar problems, improve quality performance, and reduce costs and risks12

Explanation
The project manager should hold sessions to understand user challenges and track system usage and report user activity. These steps will help the project manager to identify the root causes of the adoption issues and monitor the progress of the system utilization. They will also help to communicate with the sales organization and provide feedback and support

Scrum requires the most availability from the business team among the given options. Scrum is a popular agile framework that organizes work into short iterations called sprints, usually lasting one to four weeks. Scrum emphasizes collaboration between teams, customers, and stakeholders and encourages open communication and transparency throughout the project lifecycle. Scrum requires frequent involvement and feedback from the business team through activities such as product backlog refinement, sprint planning, sprint review, sprint retrospective, and daily scrum meetings.

The project manager should have a meeting with the project sponsor and main stakeholders first after discovering that some of the legal requirements have not been addressed during the project concept preparation. The project sponsor and main stakeholders are the key decision-makers and influencers of the project. They have the authority and responsibility to approve or reject any changes to the project scope, budget, or schedule. Having a meeting with them can help to communicate the issue, assess the impact, explore alternatives, and seek guidance on how to proceed with the project34

According to A Guide To Schedule Updating in Project Management, one of the best practices for effective schedule updating is to perform an impact analysis before making any changes to the schedule. An impact analysis helps the project manager to assess the effects of the change on the project scope, cost, quality, risk, and stakeholder expectations. It also helps to identify the best options for resolving the issue and minimizing the negative impacts. By performing an impact analysis first, the project manager can make informed decisions and communicate them clearly to the project team and stakeholders.