Archiving project documentation is an important process to ensure that the project information is stored, retrieved, and updated in a consistent and efficient manner1. It also helps to meet legal requirements, enable long-term analysis, and support new projects and team members1. If the documentation was not archived as per the PMO standards, it would be difficult for the current project manager to find the relevant documents and learn from the previous project. This would cause the current project manager to keep asking questions to the previous project manager, who may not have all the answers or may not be available. Therefore, the most likely cause of this situation is that the documentation was not archived as per the PMO standards. Reference = CompTIA Project+ Study Guide: Exam PK0-005, 3rd Edition, Chapter 14: Closing the Project, page 403; How to Archive a Completed Project: A Guide for PMOs, Introduction and Benefits sections.

The project manager should use synchronous communication methods if they prefer to have immediate contact with team members. Synchronous communication is a type of communication that occurs in real time and allows for faster response times and more interactive discussions. Examples of synchronous communication methods include phone calls, video conferences, instant messaging, and face-to-face meetings. Synchronous communication can help to build rapport, clarify doubts, and resolve issues quickly among team members.
Synchronous communication should be used when the project manager prefers to have immediate contact with team members. Synchronous communication allows for real-time interaction and feedback, enabling faster response times and more interactive discussions. References: CompTIA Project+ Study Guide Section 3.1.3

This answer is based on the best practice of using historical information and lessons learned from previous projects to improve the planning and execution of current projects12. By using existing artifacts, such as scope statements, project plans, risk registers, and change logs, the PM can leverage the knowledge and experience of the previous PM and avoid repeating the same mistakes or oversights. However, the PM should also accommodate the artifacts based on the current project success criteria, which may differ from the previous project in terms of scope, schedule, budget, quality, or stakeholder expectations34. The PM should not rely solely on the previous PM's advice, the project sponsor's report, or the project charter, as these sources may not provide enough detail or accuracy for the current project's scope statement. References = CompTIA Project+ Certification Study Guide5, CompTIA Project+ Certification Exam Objectives6, How to Use Historical Information in Project Management1, Howto Use Lessons Learned to Improve Project Management2, How to Define Project Success Criteria3, How to Use Existing Artifacts in Project Management4

Reviewing the Gantt chart weekly with the team would be the most effective step for the project manager to take to ensure clarity within the team after receiving feedback from the project sponsor that the resources involved in the project are unsure of their daily activities. A Gantt chart is a graphical tool that shows the schedule of a project, including the start and end dates, durations, dependencies, milestones, and progress of each task or activity. Reviewing the Gantt chart weekly with the team can help to clarify their roles and responsibilities, assign tasks and deadlines, track and report their status and performance, identify and resolve any issues or risks, and keep them aligned and engaged with the project goals.VVVVVVVVVVVVVV

A RACI chart would be the most useful option for the project manager to illustrate roles for major project activities for an upcoming project kickoff. A RACI chart is a visual representationof a RACI matrix that shows who is responsible, accountable, consulted, and informed for each task or activity in a project using a table format. A RACI chart can help to communicate and document the roles and expectations of each team member and stakeholder for the project and ensure alignment and agreement.