New PMP Question & Answers with explanation

To prevent the problem from happening again, the project manager has instructed the quality team to focus on the top 20 percent of causes that resulted in the identified defect. This is an example of:
Select one
A project management team is in the process of acquiring the necessary resources to complete the project activities, as specified within the human resource management plan. After considering those resources that had been promised as part of the customer contract, they discover that a key resource was not included within the initial agreement and was already committed to two other projects. To work through the best scenario, what technique can the team use?
Select one
Jon, a senior research technician, has been with the company for one year and is considered to be the top performer of his group. Because of his exceptional performance, the company has decided to promote him to the role of project manager of his department. This is an example of:
Select one
This quality management and control tool consists of two-dimensional diagrams (L-Type, T-Type, and X-Type) and three-dimensional diagrams such as C-Type. Which tool within this tool and technique does this question describe?
Select one
You are the project manager for a project that will produce a mobile phone application that sends alerts when UV rays are at dangerous levels, alerting users to stay indoors. Your team has recently adopted Agile, and you have modeled your approach on that of a servant leader. Which of the following characteristics are you likely to follow?
Select three