Which function writes a custom string during the script execution process?

The Trace function is designed to write a custom string during the script execution process in Qlik Sense. It serves as a useful debugging tool, allowing developers to output messages to the script execution log. This can help in tracking the flow of script execution, validating data transformations, or simply providing informative messages about the current state of the script.

When you utilize the Trace function, you can include any message as a custom string that gets logged. This is particularly beneficial when trying to understand where the script might be failing or confirming that certain sections of the script have been executed successfully. The ability to log messages at various points in the script enhances transparency and control over the data loading process.

The other functions mentioned do not serve the purpose of writing custom strings during the execution process. For example, the Force function is used for forcing certain conditions on data loading, while the Previous function retrieves the value of the last row of a field. Similarly, the GeoMakePoint function generates geographical coordinates based on given latitude and longitude values but does not provide logging capabilities within the script. Hence, the Trace function stands out as the correct choice for this purpose.