New PMP Question & Answers with explanation

Mary has recently finalized her project management plan and has gotten it approved. She is managing a complex manufacturing process improvement project. The project stakeholders' constant support and commitment are crucial for the success of the project. Which of the following are the most important stakeholder management processes at this stage?
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Carole is managing a hotel refurbishment project. She has identified her project's key stakeholders. Carole now wants to expand this list of stakeholders and convert it to a comprehensive list of project stakeholders. What should Carole do?
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A critical project rollout was delayed because one of the stakeholders did not receive necessary communication on time. On further analysis, the project manager discovered that the communication was sent to the wrong teams. This could have happened because:
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Lena is managing the construction of a new office facility for her company. The project is halfway through the execution. The project sponsor has asked Lena to ensure that all key project stakeholders are still committed to the project. How can Lena assess the stakeholders' current engagement levels?
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You have recently been assigned to a research project. Although there is a limited number of key stakeholders, there is a big number of other stakeholders involved in this project, especially the ones who will be using the research’s outcome. You have some specific questions. Which of the following is the best way to quickly obtain responses from a big group of stakeholders?
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