John is a new Project Manager for an IT Project. He deals with development of a software application for one of the company's clients. Since the project duration is long and has many deliverables, he needs to divide the project into several phases. In this scenario, which of the following project management process group activities becomes mandatory throughout the project, to make sure that the project is driven to completion in a controlled manner? A O Initiating process group B Planning process group C O Monitoring and controlling process group D O Closing process group