$C3.ai (AI.US)$ stock has been a tale of two valuations over the last year. Before artificial intelligence became the latest fad due to the public’s fascination with ChatGPT, the valuation of AI stock was quite attractive. For example, on Dec. 1, 2022, the shares were changing hands for roughly 3.9 times analysts’ current average 2024 revenue estimate. That’s a somewhat high valuation, but it was attractive, given the company’s strong prospects...