What is one key factor that enhances the effectiveness of AI systems?

High-quality, relevant data is essential for enhancing the effectiveness of AI systems because these systems learn and make predictions based on the data they are trained on. When the data is accurate, diverse, and representative of the real-world scenarios that the AI will encounter, it provides a solid foundation for the model to develop meaningful patterns and insights. High-quality data improves not only the model's performance in terms of accuracy but also its ability to generalize to new, unseen situations. In contrast, limited access to data can lead to underfitting, while human oversight in every decision may hinder the AI's ability to function autonomously. The use of complex programming languages does not inherently correlate with the effectiveness of AI systems, as what matters more is the data that drives those systems.