Which statement best describes the unsupervised learning process when performing clustering on a large data set?

Which statement best describes the unsupervised learning process when performing clustering on a large data set?
A . The system understands the significance of the data points and a cognitive sub-process clusters the data, removing the need for a human supervisor.
B . A neural network is deployed in unsupervised mode to determine to which cluster a data point belongs.
C . Examples of data points and their associated cluster are fed into the system allowing it to learn and generalize for the rest of the data set.
D . Data points are compared at random and the differences between their features are used to determine whether they belong in the same cluster or not.

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Answer: D