Question: SQL injection inserts a code fragment that makes a database statement universally true, like **\_**.

1. `SELECT * FROM users WHERE username = " AND 1=1--'`
2. `SELECT * FROM users WHERE username = " AND 1!=1--'`
3. `SELECT * FROM users WHERE username = " OR 1=1--'`
4. `SELECT * FROM users WHERE username = " OR 1!=1--'`

Answer: The correct answer of the above question is Option C:`SELECT * FROM users WHERE username = " OR 1=1--'`