With regard to the customer tracking system in the previous question: once the system has captured video data and successfully tracked customers around the mall for a few months, it should identify different types of customers based on which stores they have entered during that visit to the mall. These types of customers are not known to you and the system should identify them automatically. What type of machine learning problem is this?

Group of answer choices

Supervised Learning

Semi-Supervised Learning

Reinforcement Learning

Unsupervised Learning

Active Learning