The best practice in project management, as per the PMP objectives, is to mitigate risks associated with resource availability by facilitating cross-functional knowledge transfer. This ensures that multiple team members are skilled in various components of the project, which allows for continuity of work in the event of an absence. The PMBOK Guide emphasizes the importance of knowledge transfer to enhance the team's ability to manage project risks and maintain productivity1.
: = Project Management Professional (PMP) Reference Materials, particularly the sections on risk management strategies1, and the Professional in Business Analysis (PMI-PBA) Reference Materials, which discuss the knowledge areas relevant to risk mitigation and resource management23.

The project manager realizes that the project performance will be measured based on budget deviation and revenue, but without consideration for the overall project schedule. This could lead to a situation where the project is successful in terms of budget and revenue, but fails in terms of schedule. Therefore, the project manager should review the schedule baseline and consider adopting a schedule performance indicator. This will ensure that the project schedule is also taken into account when measuring project performance. References: PMBOK Guide, 6th Edition, Section 6.6.1.1, "Schedule Baseline" and Section
7.4.2.1, "Cost Performance Baseline"

According to the PMBOKGuide, a hybrid project is a project that uses a combination of predictive and adaptive (or agile) approaches to deliver the project objectives1. A hybrid project requires the project manager to balance the different needs and expectations of the stakeholders, as well as the different methods and practices of the project teams2.
In this scenario, the project manager is facing a challenge of managing a hybrid project, where the self-organizing teams are using an agile approach, but the steering committee is expecting a predictive approach. The project manager should apply the agile principle of delivering working software frequently, from a couple of weeks to a couple of months, with a preference to the shorter timescale3. This means that the project manager should suggest to the teams to limit the scope of work per iteration (or sprint) so that they can deliver more reliably and demonstrate value to the steering committee. This can also help improve the team's morale, as they can see their progress and achievements more clearly.
Option A is not the best answer because it does not address the root cause of why the teams are late in delivering their demos. Emphasizing the importance of deadlines and value may increase the pressure and stress on the teams, rather than motivate them. Option B is not the best answer because it does not provide a specific action or solution to the problem. Requesting to coach the team may be helpful, but it does not guarantee that the team will improve their performance or deliver on time. Option C is not the best answer because it does not align with the agile value of responding to change over following a plan4. Updating the project schedule with a buffer may create a false sense of security and encourage the team to procrastinate or delay their work further. References: 1 PMBOKGuide, 6th edition, page 192 PMBOKGuide, 6th edition, page 213 Agile Manifesto, Principle 34 Agile Manifesto, Value 4.

In a functional organizational structure, departments such as purchasing operate independently and are managed by their respective department heads12. When project tasks are delayed due to other priorities within a department, it is essential for the project manager to engage directly with the department causing the delay- in this case, the purchasing department. By meeting with the purchasing manager, the project manager can discuss the importance of the project's tasks, understand the reasons for the delay, and work collaboratively to establish a purchasing schedule that aligns with the project's needs while respecting the department's constraints345. This approach fosters communication and collaboration, which are key in a functional structure where the project manager has limited authority over departmental resources.
= The role of the project manager in a functional organizational structure and the importance of direct communication with department heads to resolve delays and align schedules are well-documented in project management literature12345.