#expert-systems

Question 1: Single choice

Expert systems such as XCON were a commercial success in the early 1980s, yet many were abandoned by the early 1990s. What was the main reason?

They were costly to maintain, could not learn, and failed badly on unusual inputs1
They needed GPUs to run their neural networks, and in the 1980s GPUs did not exist yet2
They learned from data and overfitted the small datasets available3
Governments banned them after a series of accidents4