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The correct answer is A.

OBJ-1.2: An indicator of compromise is an artifact observed on a network or in an operating system that, with high confidence, indicates a computer intrusion. Typical IOCs are virus signatures and IP addresses, MD5 hashes of malware files or URLs, or botnet command and control servers’ domain names. SQL injection is a code injection technique used to attack data-driven applications. Malicious SQL statements are inserted into an entry field for execution, such as dumping the database contents to the attacker. Cross-site request forgery (CSRF or XSRF) is a malicious exploit of a website where unauthorized commands are transmitted from a user that the web application trusts. There are many ways in which a malicious website can transmit commands, such as specially-crafted image tags, hidden forms, and JavaScript XMLHttpRequests can all work without the user’s interaction or even knowledge. A botnet consists of many Internet-connected devices, each of which is running one or more bots. Botnets can be used to perform Distributed Denial-of-Service (DDoS) attacks, steal data, send spam, and allows the attacker to access the device and its connection.

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