Which of the following relates directly to tracking project income?

The Projects feature is specifically designed to help track income and expenses related to individual projects within QuickBooks. By utilizing this feature, users can create a project and associate various financial transactions directly with that project. This allows for a clear overview of the profitability of each project, as it consolidates all income and expenditures related to the project in one place, providing valuable insights into financial performance.

In contrast, the Payroll center is focused on managing employee payroll and does not facilitate tracking project-specific income. The Vendor Center is primarily used for managing suppliers and their payments, which makes it less relevant for tracking project income. Similarly, the Banking section assists with managing bank accounts and transactions but does not integrate project-specific financial tracking into its functionality.