Class Activity: Build a decision tree

In this practice problem, we want to construct a decision tree for the following classification problem, represented as a training dataset:

This is a binary classification problem, and we have $4$ data points from the blue class and $5$ data points from the red class. On a paper $($or on a digital device$),$ draw a decision tree that can precisely classify the red and blue circles.

Upload an image that shows your decision tree.