Which of the following data formats are examples of unstructured data? (Choose two.)

XML is a semi-structured data format, as it uses tags to define elements and attributes, providing some organizational structure.

CSV files are structured data, organizing data into rows and columns with comma delimiters, making them highly tabular.

XLS files (Excel spreadsheets) are structured data, containing data organized in rows and columns within a worksheet structure.

PNG files are image files, which are a form of unstructured data as their internal content is not organized into a predefined, queryable schema.

JSON is a semi-structured data format, organizing data into key-value pairs and arrays, providing a flexible but defined structure.

MP4 files are video files, representing unstructured data because their multimedia content does not conform to a fixed data model or structure for direct database querying.