Which of the following is a valid google searching operator that is used to search a specified file type?

'inurl:' is a valid Google operator but it searches for a keyword within a URL string, not for a specific file type.

The 'filetype:' Google search operator filters results to pages with a specific file extension, for example 'filetype:pdf' returns only PDF documents. It is a widely used Google dorking technique in OSINT and reconnaissance to locate exposed documents such as spreadsheets, configuration files, or PDFs on target domains.

'intitle:' is a valid Google operator that searches for keywords within the HTML page title, not the file type.

'file type' with a space is not a recognized Google search operator and will be treated as a plain keyword search.