A penetration tester has identified a directory traversal vulnerability. Which of the following payloads could have helped the penetration tester identify this vulnerability?

This payload uses SQL LIKE clause syntax, indicating a SQL injection attempt against a database, not a file path traversal.

The `||` operator combined with `is /tmp/` is a Unix command injection pattern that attempts to execute shell commands, not traverse directory paths.

This is a reflected XSS payload using a script tag to redirect the browser's location, not a directory traversal technique.

The `&&` chained with `dir C:/` is a Windows command injection payload designed to execute OS commands, not to traverse file system paths via path manipulation.

The payload `../../../../../../../.` chains multiple `../` sequences to traverse up the directory tree, potentially reaching the filesystem root and exposing sensitive files like `/etc/passwd` on Linux or `C:\Windows\win.ini` on Windows. This exploits insufficient input validation on file path parameters in web applications. The multiple repetitions ensure the traversal succeeds regardless of how deeply nested the application's working directory is.