SQL injection is a very popular and successful injection attack method.

 Understanding SQL Injection Attacks:SQL injection exploits vulnerabilities in an application’s interaction with a database by injecting malicious SQL code to manipulate queries.

 About the Text ' or 1=1 --:

The input ' or 1=1 -- always evaluates to true (1=1) and the -- comments out the rest of the SQL statement.

This allows attackers to bypass authentication or extract unauthorized data.

 Why Not Other Options:

B. /../../../../: Represents a directory traversal attack, not SQL injection.

C. "DROP TABLE USERNAME": A destructive SQL command but not indicative of basic injection techniques.

D. NOPS: Refers to no-operation instructions used in buffer overflow attacks, not SQL injection.

 EC-Council Guidance:Recognizing and mitigating SQL injection is critical to securing database-driven applications, as emphasized in secure coding practices.