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Which of the following examples isan example of unsupervised...

Which of the following examples is an example of unsupervised learning?Which of the following examples is an example of unsupervised learning?

a. Based on past information about spams, filtering out a new incoming email into Inbox (normal) or Junk folder (Spam)

b. A face recognition in phone whereas your phone takes some pictures of you and next time it will only allow YOU to open the phone based on your face

c. A machine can analyze some x-rays and can predict if someone has cancer or not based on his/her x-ray.

d. NASA discovers new heavenly bodies and finds them different from previously known astronomical objects - stars, planets, asteroids, blackholes etc. (i.e. it has no knowledge about these new bodies) and categorize them the way it would like to (distance from Milky way, intensity, gravitational force, red/blue shift or whatever)

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