Based on the textbook, Agile Project Delivery: A Practical Approach for Corporate Environments Beyond Software Development (1st Edition) (2020) answer the below question: 'Should show a team's velocity improve over time as its members become more familiar with the project deliverables and complete their more complex and higher-risk user stories'. The above statement is an example of what agile KPI? a. Sprint success rate b. Team output c. Team satisfaction d. Learning curve