Which of the following is NOT included in the internal financial reporting standards?

The answer aligns with the understanding of internal financial reporting standards, particularly as it relates to the context and scope of international financial reporting practices. Generally accepted accounting principles (GAAP) are specific to the United States and are primarily designed for external reporting, rather than internal purposes.

Internal financial reporting often focuses on management accounting principles and standards established to best serve the needs of an organization's internal stakeholders. In contrast, International Accounting Standards (IAS), International Financial Reporting Standards (IFRS), and SIC Interpretations are designed to ensure consistency and transparency in financial reporting across countries and generally serve external reporting purposes.

Thus, while GAAP provides a framework for external financial reporting in the U.S., it does not fall under the category of international internal financial reporting standards, making it the correct choice for this question.