Which of the following best describes the calculation method of formula indicators?

The calculation method of formula indicators is best described as being calculated when viewed in specific interfaces. This means that the system processes the formula indicators in real-time or at the moment the user accesses them through designated views or dashboards. This approach allows for dynamic calculations based on the most current data and parameters at the time of access, ensuring that the information presented is up-to-date and relevant.

Choosing this option highlights the responsive nature of formula indicators, which are designed to deliver accurate metrics according to user needs and interface context. This calculated approach enhances user experience by providing real-time insights and reflects the importance of contextual data analytics in effective decision-making.

As for the other options, while user configurations can influence the behavior of formula indicators, they do not define how they are calculated. The idea that calculations occur when the indicator is not in use or during data migration does not align with the purpose of formula indicators, which are developed for immediate data analysis rather than being passively updated or reliant on migration processes.