roles and responsibilities of a Product Manager

Part A: EIGHT roles and responsibilities of a Product Manager (200 words).Part B: Differences between product line engineering and software product (500 words).Part C: Investigate and summarize the differences between Agile and Waterfall project management (1000 words).Part D: Clearly define (1)Scrum, (2)Scrum Team, (3)Scrum Event, (4)Scrum Artifact. (300 words).