Which of the following is included in revenue metrics?

Revenue metrics focus specifically on the various elements that directly contribute to a company's income generation. In this context, the correct choice highlights IPC (Input-Processed Cost), protections, and fuel as relevant metrics. These are integral components of revenue generation because they represent costs associated with delivering products or services that ultimately affect the profitability of the company.

The inclusion of these elements in revenue metrics allows businesses to understand and evaluate their operational efficiency related to income. By analyzing IPC, protections, and fuel, organizations can derive insights into their cost structure and profitability, making it essential for driving financial performance.

In contrast, daily customer interactions, fleet maintenance costs, and customer satisfaction ratings, while important for overall business operations and customer engagement strategies, do not directly relate to revenue generation metrics in the same way as the costs associated with the provision of goods and services do. Thus, they do not have the same direct impact on assessing revenue performance.