Which expense is aN operating expense (OPEX)?

From a Customer Success perspective, which reason to monitor your customer's health is the most important?

Refer to the exhibit.

The graph shows a customer with n software product and highlights the number of paid-for licenses (shown with the orange tine) and the number of users actively using the product (shown with the blue line).
Which statement about the customer is true?

Refer to the exhibit. Which initial action does a Customer Success Manager take?

What is the best reason for documenting your customer's success?