Final answer:
The CFR numbering system's part that provides one provision of program/function rules is the Section.
Step-by-step explanation:
The part of the CFR numbering system that provides one provision of program/function rules is a Section. The Code of Federal Regulations (CFR) is a codification of the general and permanent rules published in the Federal Register by the executive departments and agencies of the Federal Government. The CFR is divided into 50 titles that represent broad areas subject to Federal regulation, with each title being further subdivided into chapters, subchapters, parts, subparts, sections, and appendices.
When citing the CFR, the format 'Title CFR Part Section' is used. For example, '47 CFR 1.1' refers to Title 47, Part 1, Section 1 of the CFR, which details the rules and regulations managed by the FCC.