According to ASC 606, how is revenue defined?

Revenue is defined under ASC 606 as income arising from normal operating activities, primarily from the sale of goods and services. This definition highlights the focus on transactions that are integral to a company's core business operations, ensuring that revenue recognition aligns closely with the delivery of products or services to customers. ASC 606 emphasizes the importance of recognizing revenue when control of these goods or services transfers to the customer, reflecting the underlying economic realities of the transaction.

The other choices do not align with the revenue recognition framework provided by ASC 606. For instance, income generated from investments, non-operational activities, or financial gains such as interest and dividends falls outside the scope of this standard, as these sources do not relate to the primary operational purpose of the business. By explicitly defining revenue in this way, ASC 606 ensures that revenue reported on financial statements is both relevant and representative of a company's operational performance.