What are the mechanics of now a model trains?

What are the mechanics of now a model trains?
A . Decides which algorithm can best meet the use case for the application in question
B. Adjusts the model’s parameter weights such that the model can Better perform its tasks
C. Tests how accurately the model performs on a wide array of real world data
D. Detects Data drift of content drift that might compromise the ML model’s performance

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Answer: A