Final answer:
The specific number of attendees at the 2012 National FFA Convention is not provided in the reference, but such events generally have high attendance from FFA members, advisors, and supporters.
Step-by-step explanation:
The student is asking about the number of members, advisors, and supporters that attended the 2012 National FFA Convention. Unfortunately, the exact number of attendees for the 2012 National FFA Convention is not provided in the provided reference information. However, it is important to note that National FFA Organization conventions typically draw large numbers of attendees, often in the tens of thousands, consisting of FFA members, advisors, and supporters, showcasing agricultural education and student achievements. The FFA (formerly known as Future Farmers of America) connects students to agricultural careers and skills development, making the national convention a significant event for those involved in the agricultural education community.