Which of the following is NOT a requirement in Section 112(a)?

The requirement that is NOT included in Section 112(a) is the best mode of packaging the invention. Section 112(a) primarily focuses on three critical elements: the written description of the invention, enablement, and the best mode of carrying out the claimed invention.

The written description requirement ensures that the inventor provides a detailed account of the invention, allowing someone skilled in the art to understand what is being claimed. Enablement requires that the patent application describes the invention sufficiently so that a person having ordinary skill in the art can make and use the invention without undue experimentation. Lastly, the best mode requirement mandates that the inventor disclose the preferred way of carrying out the invention, ensuring that all aspects of the invention are shared with the public.

However, "best mode of packaging the invention" is not specified within Section 112(a). Packaging, in this context, does not relate to the functional implementation or operability of the invention, which are the primary concerns of Section 112(a). Thus, option C stands out as not being a requirement under this statute.