If an attacker uses the command SELECT*FROM user WHERE name = ‘x’ AND userid IS NULL; -‘; which type of SQL injection attack is the attacker performing?

If an attacker uses the command SELECT*FROM user WHERE name = ‘x’ AND userid IS NULL; –‘; which type of SQL injection attack is the attacker performing?

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If an attacker uses the command SELECT*FROM user WHERE name = ‘x’ AND userid IS NULL; –‘; which type of SQL injection attack is the attacker performing?
A . End of Line Comment
B . UNION SQL Injection
C . Illegal/Logically Incorrect Query
D . Tautology

Answer: D