waldziuchna

Damn! May have answered my own question. Initially, I had only looked at Appendix 4A. However, now I see Appendix 4B is explicitly marked as "Optional." It must mean that Appendix 4A and 4C are mandatory.

If any of you think otherwise, please share. It is still kind of weird that the sections on which those appendices (4A and 4C) are based are all marked "Optional."