All projects go through a predictable pattern of activity, referred to as a project life cycle. The major types of project life cycle models have some things in common. Which of these is a characteristic that all project life cycles have in common? a. They all have four phases: Selecting & Initiating, Planning, Executing, and Closing & Realizing. b. They are all predictive and plan-driven. c. They all involve a series of phases that need to be completed and approved before proceeding to the next phase. d. They are all based on the Project Management Institute's 5 process groups