Based on the book, Kerzner, H. (2017). Project Management: A systems approach to Planning, Scheduling, and Controlling (12th ed.). or in PMBOK 7th Edition, answer the below question: A contractor is billing a project for a client $120 per hour plus materials. This is an example of what type of contract? a. Unit price b. Cost plus fixed fee c. Lump-sum d. Time and materials