New PMP Question & Answers with explanation

Project has faced major difficulties in the quality of its deliverables. Management now states that quality is the most important project constraint. Lf another problem with quality were to occur. What would be the best thing for the project manager to do?
Select one
In quality terms, one of the meanings of “out of control” is:
Select one
Your customer requested that the new railroad cars you are building for his company be constructed from heavy grade aluminum. After reviewing the requirements, two of your experts inform you that the customer would be better off with steel cars. You meet with the customer to discuss the issue, and he directs you to go ahead with the aluminum cars. What should you do?
Select one
A project is facing a major change to its project deliverables. If the project manager is involved in determining which quality standards are relevant to the change. The project manager must be involved in:
Select one
Which of the following is an example of a tool used in quality planning?
Select one