New PMP Question & Answers with explanation

Cloud Divine is a startup company that provides SaaS using cloud computing. The first major project launched by the company involved a high degree of ambiguity and experienced issues, including a large number of changes to the project deliverables, nearly resulting in a failed project. All projects within the company are managed using a predictive life-cycle approach. What is the most likely cause for the high degree of issues experienced in the project?
Select two
Which of the following statements are true?
Select three
The project manager of a pharmaceutical company sent an email to one of his project team members apologizing for ending their recent conversation abruptly. What type of communication did the project manager use?
Select one
Which of the following best describes an incremental life cycle?
Select one
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