Question from the Deep learning - Fundamentals test

... the machine trains the model using a labeled training data set (for each of this set’s input data is there a corresponding output data).

...the machine trains the model using an unlabeled training data set: input data isn’t related to any output data.

... training data set can either be labeled or not: “unsupervised” simply means that the developer can't modify by hand the model generated by the neural network