Which one of the provided file formats is commonly used by APIs and Web Services to return data? 1 pointXLSXML Delimited file JSON

The file format commonly used by APIs and web services to return data is JSON (JavaScript Object Notation). JSON is a lightweight data interchange format that is easy for humans to read and write, as well as easy for machines to parse and generate. It is language-independent and widely supported across various programming environments, making it a popular choice for data exchange in web-based applications.

In contrast, XLS refers to Excel spreadsheets, XML is more verbose and primarily used for structured data in the context of document markup, and delimited files may require additional parsing complexity compared to JSON. Therefore, your best option is JSON for APIs and web services.