What does Appendix A of 600-55 include?

Answer: C — References

Appendix A of 600-55 contains references that are critical for supporting the content of the document. This includes a selection of sources, regulations, guidelines, and literature that provide further reading and context for practitioners in the field. These references enhance the understanding of key concepts and practices outlined in the main body of the document, ensuring that users can access the foundational information behind the guidelines and methodologies presented. This is essential for anyone looking to deepen their knowledge or seek validation for the techniques and approaches discussed throughout the material.