A large online retailer has collected data about customers over a period of $10$ years, including items that were bought, the time of day sales were made, and the frequency of purchases. Which of the following methods would you use to gain insight into the behaviour of customer groups?

Question $9$Select one:

a$.$

Hierarchical clustering

b$.$

Multilayer perceptron

c$.$

Tree$-$based model

d$.$

K$-$means clustering