Explanation:

- File extension (Option 2)

- File extensions are the suffixes at the end of filenames.

- They typically consist of a dot and several letters (e.g., ".txt", ".jpg").

- File extensions help identify the file type and determine which application can open it.

- File name

- The file name is the complete name of the file, including both the name itself and its extension.

- By itself, it might not indicate the type of file if the extension is missing.

- Path

- A path refers to the file's location on a storage device.

- It doesn't indicate the file type.

- Folder

- A folder is a container for organizing files, not a tool for identifying file types.

- All of these

- This option is incorrect. Not all elements provide information about the file type.