Enterprise artificial intelligence company C3.ai Inc AI’s stock is plunging after-hours Wednesday following its first-quarter earnings report. Here are the key highlights.What Happened: C3.ai reported first-quarter revenue of $87.2 million, up 21$86.9 million, according to data from Benzinga Pro.Subscription revenue was $73.5 million in the first quarter, up 20%. Subscription revenue made up 84% of the company's total revenue in the fi ...