An analyst discovers a suspicious item in the SQL server logs. Which of the following could be evidence of an attempted SQL injection?

This command is a Unix/Linux command used to read the shadow file, which contains hashed user passwords. While it indicates a potential security concern, it does not specifically relate to SQL injection attempts, which target SQL databases rather than operating system files.

The 'dig' command is a domain information groper used for querying DNS records. This choice is unrelated to SQL injection as it pertains to network-level queries rather than the manipulation of SQL statements to exploit vulnerabilities in a database.

This command is used to change directories in a Unix/Linux filesystem, specifically moving up the directory structure. Although it may suggest an attempt to navigate file system directories, it does not indicate an SQL injection attempt, as it does not involve any SQL syntax or database queries.