A developer created a trigger on a custom object. This custom object also has some dependent pick lists. According to the order of execution rules, which step happens first?

System validation for maximum field lengths is a server-side step that occurs later in the order of execution, after client-side validation and before `before trigger` execution.

Loading the original record from the database occurs on the server-side, after client-side validation and after the new record values have been submitted to the server.

Overwriting old values with new record values is part of the server-side processing, specifically after the original record has been loaded and before or during the `before trigger` phase.

The Salesforce order of execution starts with client-side validation, where any JavaScript validation rules, such as those governing dependent picklists, execute in the browser before the record data is submitted to the server for processing.