A data scientist creating categories and training the algorithm on large data sets is an...

AAISM classifies learning paradigms by the presence of labeled targets. Creating categories (labels) and training on them is supervised learning, where input features are mapped to known outputs and optimization minimizes prediction error against ground truth. Unsupervised (B) discovers structure without labels; reinforcement (A) optimizes behavior via rewards; “machine learning” (C) is the broad field, not the specific technique.