Is this missing at random?

You've seen in the video exercise how there are a variety of missingness types when observing missing data. As a reminder, missingness types can be described as the following:

• Missing Completely at Random: No systematic relationship between a column's missing values and other or own values.
• Missing at Random: There is a systematic relationship between a column's missing values and other observed values.
• Missing not at Random: There is a systematic relationship between a column's missing values and unobserved values.

You have a DataFrame containing customer satisfaction scores for a service. What type of missingness is the following?

                              A customer satisfaction_score column with missing values for highly dissatisfied customers.