Which of the following is included in Article III of the Implementing Rules and Regulations governing the practice of aeronautical engineering in the Philippines?

The correct choice focuses on the fundamental principles surrounding the "Practice of aeronautical engineering." Article III of the Implementing Rules and Regulations typically outlines the aspects related to the professional practice within the field. This includes regulations that define what constitutes the practice, the scope of work for aeronautical engineers, and the responsibilities and requirements expected from professionals in this field.

This choice aptly highlights the core activities and standards that guide the profession, ensuring that practitioners adhere to the necessary legal and operational frameworks. This is essential for ensuring public safety and upholding the integrity of the engineering profession within the aviation sector.

In contrast, aspects like proof of qualification for examination, exemptions from examination, and codes of professional ethics, while important for the regulation of the profession, generally belong to different articles or sections that focus on licensure requirements and ethical standards rather than defining the practice itself. Thus, the selection underscores the regulatory framework specifically concerned with defining and governing the operational practice of aeronautical engineering.