In what type of learning labelled training data is used

unsupervised learning
supervised learning
reinforcement learning
active learning

The correct answer is B. supervised learning.

Supervised learning is a type of machine learning in which a model is trained on labeled data. This means that the model is given a set of data that includes both the input data and the desired output. The model then learns to map the input data to the output data.

Supervised learning is a very powerful tool that can be used to solve a wide variety of problems. For example, supervised learning can be used to classify images, predict customer churn, and recommend products.

Here is a brief explanation of each option:

  • A. Unsupervised learning is a type of machine learning in which a model is trained on unlabeled data. This means that the model is given a set of data that does not include the desired output. The model then learns to find patterns in the data without any guidance.
  • C. Reinforcement learning is a type of machine learning in which a model learns to take actions in an environment in order to maximize a reward. The model is not given any labeled data, but it learns from trial and error.
  • D. Active learning is a type of machine learning in which a model is allowed to select the data that it is trained on. This can be useful in situations where labeled data is scarce.